xdiff_string_patch
<?php
/**
* XML to Associative Array Class
*
* Usage:
* $domObj = new xmlToArrayParser($xml);
* $domArr = $domObj->array;
*
* if($domObj->parse_error) echo $domObj->get_xml_error();
* else print_r($domArr);
*
* On Success:
* eg. $domArr['top']['element2']['attrib']['var2'] => val2
*
* On Error:
* eg. Error Code [76] "Mismatched tag", at char 58 on line 3
*/
/**
* Convert an xml file or string to an associative array (including the tag attributes):
* $domObj = new xmlToArrayParser($xml);
* $elemVal = $domObj->array['element']
* Or: $domArr=$domObj->array; $elemVal = $domArr['element'].
*
* @version 2.0
* @param Str $xml file/string.
*/
class xmlToArrayParser {
/** The array created by the parser can be assigned to any variable: $anyVarArr = $domObj->array.*/
public $array = array();
public $parse_error = false;
private $parser;
private $pointer;
/** Constructor: $domObj = new xmlToArrayParser($xml); */
public function __construct($xml) {
$this->pointer =& $this->array;
$this->parser = xml_parser_create("UTF-8");
xml_set_object($this->parser, $this);
xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($this->parser, "tag_open", "tag_close");
xml_set_character_data_handler($this->parser, "cdata");
$this->parse_error = xml_parse($this->parser, ltrim($xml))? false : true;
}
/** Free the parser. */
public function __destruct() { xml_parser_free($this->parser);}
/** Get the xml error if an an error in the xml file occured during parsing. */
public function get_xml_error() {
if($this->parse_error) {
$errCode = xml_get_error_code ($this->parser);
$thisError = "Error Code [". $errCode ."] \"<strong style='color:red;'>" . xml_error_string($errCode)."</strong>\",
at char ".xml_get_current_column_number($this->parser) . "
on line ".xml_get_current_line_number($this->parser)."";
}else $thisError = $this->parse_error;
return $thisError;
}
private function tag_open($parser, $tag, $attributes) {
$this->convert_to_array($tag, 'attrib');
$idx=$this->convert_to_array($tag, 'cdata');
if(isset($idx)) {
$this->pointer[$tag][$idx] = Array('@idx' => $idx,'@parent' => &$this->pointer);
$this->pointer =& $this->pointer[$tag][$idx];
}else {
$this->pointer[$tag] = Array('@parent' => &$this->pointer);
$this->pointer =& $this->pointer[$tag];
}
if (!empty($attributes)) { $this->pointer['attrib'] = $attributes; }
}
/** Adds the current elements content to the current pointer[cdata] array. */
private function cdata($parser, $cdata) { $this->pointer['cdata'] = trim($cdata); }
private function tag_close($parser, $tag) {
$current = & $this->pointer;
if(isset($this->pointer['@idx'])) {unset($current['@idx']);}
$this->pointer = & $this->pointer['@parent'];
unset($current['@parent']);
if(isset($current['cdata']) && count($current) == 1) { $current = $current['cdata'];}
else if(empty($current['cdata'])) {unset($current['cdata']);}
}
/** Converts a single element item into array(element[0]) if a second element of the same name is encountered. */
private function convert_to_array($tag, $item) {
if(isset($this->pointer[$tag][$item])) {
$content = $this->pointer[$tag];
$this->pointer[$tag] = array((0) => $content);
$idx = 1;
}else if (isset($this->pointer[$tag])) {
$idx = count($this->pointer[$tag]);
if(!isset($this->pointer[$tag][0])) {
foreach ($this->pointer[$tag] as $key => $value) {
unset($this->pointer[$tag][$key]);
$this->pointer[$tag][0][$key] = $value;
}}}else $idx = null;
return $idx;
}
}
?>
This is supplimental information for the "class xmlToArrayParser".
This is a fully functional error free, extensively tested php class unlike the posts that follow it.
Key phrase: Fully functional, fully tested, error free XML To Array parser.
<?php
/**
* class xmlToArrayParser
*
Notes:
1. 'attrib' and 'cdata' are keys added to the array when the element contains both attributes and content.
2. Ignores content that is not in between it's own set of tags.
3. Don't know if it recognizes processing instructions nor do I know about processing instructions.
<\?some_pi some_attr="some_value"?> This is the same as a document declaration.
4. Empty elements are not included unless they have attributes.
5. Version 2.0, Dec. 2, 2011, added xml error reporting.
Usage:
$domObj = new xmlToArrayParser($xml);
$elemVal = $domObj->array['element']
Or assign the entire array to its own variable:
$domArr = $domObj->array;
$elemVal = $domArr['element']
Example:
$xml = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<top>
<element1>element content 1</element1>
<element2 var2="val2" />
<element3 var3="val3" var4="val4">element content 3</element3>
<element3 var5="val5">element content 4</element3>
<element3 var6="val6" />
<element3>element content 7</element3>
</top>';
$domObj = new xmlToArrayParser($xml);
$domArr = $domObj->array;
if($domObj->parse_error) echo $domObj->get_xml_error();
else print_r($domArr);
On Success:
$domArr['top']['element1'] => element content 1
$domArr['top']['element2']['attrib']['var2'] => val2
$domArr['top']['element3']['0']['attrib']['var3'] => val3
$domArr['top']['element3']['0']['attrib']['var4'] => val4
$domArr['top']['element3']['0']['cdata'] => element content 3
$domArr['top']['element3']['1']['attrib']['var5'] => val5
$domArr['top']['element3']['1']['cdata'] => element content 4
$domArr['top']['element3']['2']['attrib']['var6'] => val6
$domArr['top']['element3']['3'] => element content 7
On Error:
Error Code [76] "Mismatched tag", at char 58 on line 3
*
*/
?>
CLXVIII. XML Parser Functions
Wstęp
XML (eXtensible Markup Language) is a data format for structured document interchange on the Web. It is a standard defined by The World Wide Web consortium (W3C). Information about XML and related technologies can be found at http://www.w3.org/XML/.
This PHP extension implements support for James Clark's expat in PHP. This toolkit lets you parse, but not validate, XML documents. It supports three source character encodings also provided by PHP: US-ASCII, ISO-8859-1 and UTF-8. UTF-16 is not supported.
This extension lets you create XML parsers and then define handlers for different XML events. Each XML parser also has a few parameters you can adjust.
Wymagania
This extension uses an expat compat layer by default. It can use also expat, which can be found at http://www.jclark.com/xml/expat.html. The Makefile that comes with expat does not build a library by default, you can use this make rule for that:
libexpat.a: $(OBJS)
ar -rc $@ $(OBJS)
ranlib $@ |
Instalacja
Domyślnie te funkcje są włączone i używają dołączonej biblioteki expat. Możesz wyłączyć wsparcie dla XML za pomocą --disable-xml. Jeżeli kompilujesz PHP jako moduł do Apache w wersji 1.3.9 lub późniejszej, wówczas PHP automatycznie użyje biblioteki expat dołączonej do Apache. Jeśli nie chcesz używać dołączonej wersji biblioteki expat to skonfiguruj PHP z --with-expat-dir=KATALOG gdzie KATALOG powinien wskazywać na katalog gdzie zainstalowano expat.
PHP w wersji dla systemów Windows posiada wbudowaną obsługę dla tego rozszerzenia. Nie trzeba ładować żadnych dodatkowych rozszerzeń aby korzystać z tych funkcji.
Konfiguracja czasu wykonywania
To rozszerzenie nie definiuje posiada żadnych dyrektyw konfiguracyjnych w pliku php.ini.
Typy zasobów
xml
The xml resource as returned by xml_parser_create() and xml_parser_create_ns() references an xml parser instance to be used with the functions provided by this extension.
Stałe predefinopwane
Poniższe stałe są zdefiniowane w tym rozszerzeniu i stają się dostępne, gdy rozszerzenie jest dokompilowane do PHP, lub załadowane dynamicznie przy starcie.
- XML_ERROR_NONE (integer)
- XML_ERROR_NO_MEMORY (integer)
- XML_ERROR_SYNTAX (integer)
- XML_ERROR_NO_ELEMENTS (integer)
- XML_ERROR_INVALID_TOKEN (integer)
- XML_ERROR_UNCLOSED_TOKEN (integer)
- XML_ERROR_PARTIAL_CHAR (integer)
- XML_ERROR_TAG_MISMATCH (integer)
- XML_ERROR_DUPLICATE_ATTRIBUTE (integer)
- XML_ERROR_JUNK_AFTER_DOC_ELEMENT (integer)
- XML_ERROR_PARAM_ENTITY_REF (integer)
- XML_ERROR_UNDEFINED_ENTITY (integer)
- XML_ERROR_RECURSIVE_ENTITY_REF (integer)
- XML_ERROR_ASYNC_ENTITY (integer)
- XML_ERROR_BAD_CHAR_REF (integer)
- XML_ERROR_BINARY_ENTITY_REF (integer)
- XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF (integer)
- XML_ERROR_MISPLACED_XML_PI (integer)
- XML_ERROR_UNKNOWN_ENCODING (integer)
- XML_ERROR_INCORRECT_ENCODING (integer)
- XML_ERROR_UNCLOSED_CDATA_SECTION (integer)
- XML_ERROR_EXTERNAL_ENTITY_HANDLING (integer)
- XML_OPTION_CASE_FOLDING (integer)
- XML_OPTION_TARGET_ENCODING (integer)
- XML_OPTION_SKIP_TAGSTART (integer)
- XML_OPTION_SKIP_WHITE (integer)
Event Handlers
The XML event handlers defined are:
Tabela 1. Supported XML handlers
| PHP function to set handler | Event description |
|---|---|
| xml_set_element_handler() | Element events are issued whenever the XML parser encounters start or end tags. There are separate handlers for start tags and end tags. |
| xml_set_character_data_handler() | Character data is roughly all the non-markup contents of XML documents, including whitespace between tags. Note that the XML parser does not add or remove any whitespace, it is up to the application (you) to decide whether whitespace is significant. |
| xml_set_processing_instruction_handler() | PHP programmers should be familiar with processing instructions (PIs) already. <?php ?> is a processing instruction, where php is called the "PI target". The handling of these are application-specific, except that all PI targets starting with "XML" are reserved. |
| xml_set_default_handler() | What goes not to another handler goes to the default handler. You will get things like the XML and document type declarations in the default handler. |
| xml_set_unparsed_entity_decl_handler() | This handler will be called for declaration of an unparsed (NDATA) entity. |
| xml_set_notation_decl_handler() | This handler is called for declaration of a notation. |
| xml_set_external_entity_ref_handler() | This handler is called when the XML parser finds a reference to an external parsed general entity. This can be a reference to a file or URL, for example. See the external entity example for a demonstration. |
Case Folding
The element handler functions may get their element names case-folded. Case-folding is defined by the XML standard as "a process applied to a sequence of characters, in which those identified as non-uppercase are replaced by their uppercase equivalents". In other words, when it comes to XML, case-folding simply means uppercasing.
By default, all the element names that are passed to the handler functions are case-folded. This behaviour can be queried and controlled per XML parser with the xml_parser_get_option() and xml_parser_set_option() functions, respectively.
Error Codes
The following constants are defined for XML error codes (as returned by xml_parse()):
| XML_ERROR_NONE |
| XML_ERROR_NO_MEMORY |
| XML_ERROR_SYNTAX |
| XML_ERROR_NO_ELEMENTS |
| XML_ERROR_INVALID_TOKEN |
| XML_ERROR_UNCLOSED_TOKEN |
| XML_ERROR_PARTIAL_CHAR |
| XML_ERROR_TAG_MISMATCH |
| XML_ERROR_DUPLICATE_ATTRIBUTE |
| XML_ERROR_JUNK_AFTER_DOC_ELEMENT |
| XML_ERROR_PARAM_ENTITY_REF |
| XML_ERROR_UNDEFINED_ENTITY |
| XML_ERROR_RECURSIVE_ENTITY_REF |
| XML_ERROR_ASYNC_ENTITY |
| XML_ERROR_BAD_CHAR_REF |
| XML_ERROR_BINARY_ENTITY_REF |
| XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF |
| XML_ERROR_MISPLACED_XML_PI |
| XML_ERROR_UNKNOWN_ENCODING |
| XML_ERROR_INCORRECT_ENCODING |
| XML_ERROR_UNCLOSED_CDATA_SECTION |
| XML_ERROR_EXTERNAL_ENTITY_HANDLING |
Character Encoding
PHP's XML extension supports the Unicode character set through different character encodings. There are two types of character encodings, source encoding and target encoding. PHP's internal representation of the document is always encoded with UTF-8.
Source encoding is done when an XML document is parsed. Upon creating an XML parser, a source encoding can be specified (this encoding can not be changed later in the XML parser's lifetime). The supported source encodings are ISO-8859-1, US-ASCII and UTF-8. The former two are single-byte encodings, which means that each character is represented by a single byte. UTF-8 can encode characters composed by a variable number of bits (up to 21) in one to four bytes. The default source encoding used by PHP is ISO-8859-1.
Target encoding is done when PHP passes data to XML handler functions. When an XML parser is created, the target encoding is set to the same as the source encoding, but this may be changed at any point. The target encoding will affect character data as well as tag names and processing instruction targets.
If the XML parser encounters characters outside the range that its source encoding is capable of representing, it will return an error.
If PHP encounters characters in the parsed XML document that can not be represented in the chosen target encoding, the problem characters will be "demoted". Currently, this means that such characters are replaced by a question mark.
Przykłady
Here are some example PHP scripts parsing XML documents.
XML Element Structure Example
This first example displays the structure of the start elements in a document with indentation.
XML Tag Mapping Example
Przykład 2. Map XML to HTML This example maps tags in an XML document directly to HTML tags. Elements not found in the "map array" are ignored. Of course, this example will only work with a specific XML document type.
|
XML External Entity Example
This example highlights XML code. It illustrates how to use an external entity reference handler to include and parse other documents, as well as how PIs can be processed, and a way of determining "trust" for PIs containing code.
XML documents that can be used for this example are found below the example (xmltest.xml and xmltest2.xml.)
Przykład 3. External Entity Example
|
Przykład 4. xmltest.xml
|
This file is included from xmltest.xml:
- Spis treści
- utf8_decode -- Konwertuje ciąg znaków w ISO-8859-1 zakodowany w UTF-8 do jednobajtowego ISO-8859-1
- utf8_encode -- Koduje ciąg znaków w ISO-8859-1 do UTF-8
- xml_error_string -- Pobiera łańcuch znaków zawierający błąd parsera XML
- xml_get_current_byte_index -- Pobiera aktualny indeks bajtu parsera XML
- xml_get_current_column_number -- Pobiera aktualny numer kolumny dla parsera XML
- xml_get_current_line_number -- Pobiera aktualny numer linii dla parsera XML
- xml_get_error_code -- Pobiera kod błędu parsera XML
- xml_parse_into_struct -- Parse XML data into an array structure
- xml_parse -- rozpoczyna parsowanie dokumentu XML
- xml_parser_create_ns -- Create an XML parser with namespace support
- xml_parser_create -- tworzy parser XML
- xml_parser_free -- Zwalnia parser XML
- xml_parser_get_option -- Get options from an XML parser
- xml_parser_set_option -- Set options in an XML parser
- xml_set_character_data_handler -- Set up character data handler
- xml_set_default_handler -- Set up default handler
- xml_set_element_handler -- Ustawia początkową i końcową procedurę obsługi elementu
- xml_set_end_namespace_decl_handler -- Set up end namespace declaration handler
- xml_set_external_entity_ref_handler -- Set up external entity reference handler
- xml_set_notation_decl_handler -- Set up notation declaration handler
- xml_set_object -- Use XML Parser within an object
- xml_set_processing_instruction_handler -- Set up processing instruction (PI) handler
- xml_set_start_namespace_decl_handler -- Set up start namespace declaration handler
- xml_set_unparsed_entity_decl_handler -- Set up unparsed entity declaration handler
add a note
User Contributed Notes
XML Parser Functions
Glen at ITIStudios dot ca
02-Dec-2011 03:37
wolfon.AT-DoG.inbox.ru
28-Jul-2008 03:09
Finally a simple xml => array class.
Functioning like SimpleXML library.
<?php
class xml {
private $parser;
private $pointer;
public $dom;
public function __construct($data) {
$this->pointer =& $this->dom;
$this->parser = xml_parser_create();
xml_set_object($this->parser, $this);
xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($this->parser, "tag_open", "tag_close");
xml_set_character_data_handler($this->parser, "cdata");
xml_parse($this->parser, $data);
}
private function tag_open($parser, $tag, $attributes) {
if (isset($this->pointer[$tag]['@attributes'])) {
$content = $this->pointer[$tag];
$this->pointer[$tag] = array(0 => $content);
$idx = 1;
} else if (isset($this->pointer[$tag]))
$idx = count($this->pointer[$tag]);
if (isset($idx)) {
$this->pointer[$tag][$idx] = Array(
'@idx' => $idx,
'@parent' => &$this->pointer);
$this->pointer =& $this->pointer[$tag][$idx];
} else {
$this->pointer[$tag] = Array(
'@parent' => &$this->pointer);
$this->pointer =& $this->pointer[$tag];
}
if (!empty($attributes))
$this->pointer['@attributes'] = $attributes;
}
private function cdata($parser, $cdata) {
$this->pointer['@data'] = $cdata;
}
private function tag_close($parser, $tag) {
$current = & $this->pointer;
if (isset($this->pointer['@idx']))
unset($current['@idx']);
$this->pointer = & $this->pointer['@parent'];
unset($current['@parent']);
if (isset($current['@data']) && count($current) == 1)
$current = $current['@data'];
else if (empty($current['@data'])||$current['@data']==0)
unset($current['@data']);
}
}
?>
maybe I'll do some explanations on habr
geoff at spacevs dot com
07-Nov-2007 09:13
Reading xml into a class:
<?PHP
class XmlData {}
$elements = array();
$elements[] =& new XmlData();
function startElement($parser, $name, $attrs) {
global $elements;
$element =& new XMLData();
$elements[count($elements)-1]->$name =& $element;
$elements[] =& $element;
}
function endElement($parser, $name) {
global $elements;
array_pop($elements);
}
function characterData($parser, $data) {
global $elements;
$elements[count($elements)-1]->data = $data;
}
$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
xml_parse($xml_parser, $xml, true);
xml_parser_free($xml_parser);
$request =& array_pop($elements);
echo $request->LOGIN->USER->data;
?>
demonpants at gmail dot com
22-Oct-2007 08:59
I wanted to access the ISBN database, and was previously parsing the HTML string generated from their main page, that is until I discovered they have an API that returns XML.
So, if anyone wants to get some information from the ISBN database, all you need to do is the following.
<?php
//Search the ISBN database for the book.
$url = "http://www.isbndb.com/api/books.xml? access_key=KEY&index1=isbn&value1=$_GET[ISBN]";
$p = xml_parser_create();
xml_parse_into_struct($p,file_get_contents($url),$results,$index);
xml_parser_free($p);
$title = $results[$index[TITLELONG][0]][value];
$author = $results[$index[AUTHORSTEXT][0]][value];
$publisher = $results[$index[PUBLISHERTEXT][0]][value];
?>
You will need to get an access key from isbndb.com, but it takes two seconds and is free. When you get it, replace KEY in the URL with your own key. Also, my code above will search for the book that fits the ISBN number stored in the GET variable ISBN - you can search by other parameters and return more than one result, but my example is for a simple ISBN search.
Zvjezdan Patz
09-Sep-2007 08:22
The problem I had was I needed to generate xml on the screen for users to actually see and copy to a file.
I'm generating the xml manually from a php file and the browser kept interpreting the xml...not very helpful.
This is how you get around it:
<?php
$file = file_get_contents("http://example.com/xml.php?whatever=$whatever");
print nl2br(htmlentities($file));
?>
Prints all my xml quite nicely.
v9 at fakehalo dot us
13-Jul-2007 08:04
I needed this for work/personal use. Sometimes you'll have a XML string generated as one long string and no line breaks...nusoap in the case of today/work, but there are any other number of possible things that will generate these. Anyways, this simply takes a long XML string and returns an indented/line-breaked version of the string for display/readability.
<?php
function xmlIndent($str){
$ret = "";
$indent = 0;
$indentInc = 3;
$noIndent = false;
while(($l = strpos($str,"<",$i))!==false){
if($l!=$r && $indent>0){ $ret .= "\n" . str_repeat(" ",$indent) . substr($str,$r,($l-$r)); }
$i = $l+1;
$r = strpos($str,">",$i)+1;
$t = substr($str,$l,($r-$l));
if(strpos($t,"/")==1){
$indent -= $indentInc;
$noIndent = true;
}
else if(($r-$l-strpos($t,"/"))==2 || substr($t,0,2)=="<?"){ $noIndent = true; }
if($indent<0){ $indent = 0; }
if($ret){ $ret .= "\n"; }
$ret .= str_repeat(" ",$indent);
$ret .= $t;
if(!$noIndent){ $indent += $indentInc; }
$noIndent = false;
}
$ret .= "\n";
return($ret);
}
?>
(...this was only tested for what i needed at work, could POSSIBLY need additions)
geoffers [at] gmail [dot] com
30-Dec-2006 03:27
Time to add my attempt at a very simple script that parses XML into a structure:
<?php
class Simple_Parser
{
var $parser;
var $error_code;
var $error_string;
var $current_line;
var $current_column;
var $data = array();
var $datas = array();
function parse($data)
{
$this->parser = xml_parser_create('UTF-8');
xml_set_object($this->parser, $this);
xml_parser_set_option($this->parser, XML_OPTION_SKIP_WHITE, 1);
xml_set_element_handler($this->parser, 'tag_open', 'tag_close');
xml_set_character_data_handler($this->parser, 'cdata');
if (!xml_parse($this->parser, $data))
{
$this->data = array();
$this->error_code = xml_get_error_code($this->parser);
$this->error_string = xml_error_string($this->error_code);
$this->current_line = xml_get_current_line_number($this->parser);
$this->current_column = xml_get_current_column_number($this->parser);
}
else
{
$this->data = $this->data['child'];
}
xml_parser_free($this->parser);
}
function tag_open($parser, $tag, $attribs)
{
$this->data['child'][$tag][] = array('data' => '', 'attribs' => $attribs, 'child' => array());
$this->datas[] =& $this->data;
$this->data =& $this->data['child'][$tag][count($this->data['child'][$tag])-1];
}
function cdata($parser, $cdata)
{
$this->data['data'] .= $cdata;
}
function tag_close($parser, $tag)
{
$this->data =& $this->datas[count($this->datas)-1];
array_pop($this->datas);
}
}
$xml_parser = new Simple_Parser;
$xml_parser->parse('<foo><bar>test</bar></foo>');
?>
Didier: dlvb ** free * fr
24-Dec-2006 09:53
Hi !
After parsing the XML and modifying it, I just add a method to rebuild the XML form the internal structure (xmlp->document).
The method xmlp->toXML writes into xmlp->XML attributes. Then, you just have to output it.
I hope it helps.
<?php
class XMLParser {
var $parser;
var $filePath;
var $document;
var $currTag;
var $tagStack;
var $XML;
var $_tag_to_close = false;
var $TAG_ATTRIBUT = 'attr';
var $TAG_DATA = 'data';
function XMLParser($path) {
$this->parser = xml_parser_create();
$this->filePath = $path;
$this->document = array();
$this->currTag =& $this->document;
$this->tagStack = array();
$this->XML = "";
}
function parse() {
xml_set_object($this->parser, $this);
xml_set_character_data_handler($this->parser, 'dataHandler');
xml_set_element_handler($this->parser, 'startHandler', 'endHandler');
if(!($fp = fopen($this->filePath, "r"))) {
die("Cannot open XML data file: $this->filePath");
return false;
}
while($data = fread($fp, 4096)) {
if(!xml_parse($this->parser, $data, feof($fp))) {
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($this->parser)),
xml_get_current_line_number($this->parser)));
}
}
fclose($fp);
xml_parser_free($this->parser);
return true;
}
function startHandler($parser, $name, $attribs) {
if(!isset($this->currTag[$name]))
$this->currTag[$name] = array();
$newTag = array();
if(!empty($attribs))
$newTag[$this->TAG_ATTRIBUT] = $attribs;
array_push($this->currTag[$name], $newTag);
$t =& $this->currTag[$name];
$this->currTag =& $t[count($t)-1];
array_push($this->tagStack, $name);
}
function dataHandler($parser, $data) {
$data = trim($data);
if(!empty($data)) {
if(isset($this->currTag[$this->TAG_DATA]))
$this->currTag[$this->TAG_DATA] .= $data;
else
$this->currTag[$this->TAG_DATA] = $data;
}
}
function endHandler($parser, $name) {
$this->currTag =& $this->document;
array_pop($this->tagStack);
for($i = 0; $i < count($this->tagStack); $i++) {
$t =& $this->currTag[$this->tagStack[$i]];
$this->currTag =& $t[count($t)-1];
}
}
function clearOutput () {
$this->XML = "";
}
function openTag ($tag) {
$this->XML.="<".strtolower ($tag);
$this->_tag_to_close = true;
}
function closeTag () {
if ($this->_tag_to_close) {
$this->XML.=">";
$this->_tag_to_close = false;
}
}
function closingTag ($tag) {
$this->XML.="</".strtolower ($tag).">";
}
function output_attributes ($contenu_fils) {
foreach ($contenu_fils[$this->TAG_ATTRIBUT] as $nomAttribut => $valeur) {
$this->XML.= " ".strtolower($nomAttribut)."=\"".$valeur."\"";
}
}
function addData ($texte) {
// to be completed
$ca = array ("é", "è", "ê", "à");
$par = array ("é", "è", "ê", "agrave;");
return htmlspecialchars(str_replace ($ca, $par, $texte), ENT_NOQUOTES);
}
function toXML ($tags="") {
if ($tags=="") {
$tags = $this->document;
$this->clearOutput ();
}
foreach ($tags as $tag => $contenu) {
$this->process ($tag, $contenu);
}
}
function process ($tag, $contenu) {
// Pour tous les TAGs
foreach ($contenu as $indice => $contenu_fils) {
$this->openTag ($tag);
// Pour tous les fils (non attribut et non data)
foreach ($contenu_fils as $tagFils => $fils) {
switch ($tagFils) {
case $this->TAG_ATTRIBUT:
$this->output_attributes ($contenu_fils);
$this->closeTag ();
break;
case $this->TAG_DATA:
$this->closeTag ();
$this->XML.= $this->addData ($contenu_fils [$this->TAG_DATA]);
break;
default:
$this->closeTag ();
$this->process ($tagFils, $fils);
break;
}
}
$this->closingTag ($tag);
}
}
}
?>
forquan
28-Jan-2006 03:45
Here's code that will create an associative array from an xml file. Keys are the tag data and subarrays are formed from attributes and child tags
<?php
$p =& new xmlParser();
$p->parse('/*xml file*/');
print_r($p->output);
?>
<?php
class xmlParser{
var $xml_obj = null;
var $output = array();
var $attrs;
function xmlParser(){
$this->xml_obj = xml_parser_create();
xml_set_object($this->xml_obj,$this);
xml_set_character_data_handler($this->xml_obj, 'dataHandler');
xml_set_element_handler($this->xml_obj, "startHandler", "endHandler");
}
function parse($path){
if (!($fp = fopen($path, "r"))) {
die("Cannot open XML data file: $path");
return false;
}
while ($data = fread($fp, 4096)) {
if (!xml_parse($this->xml_obj, $data, feof($fp))) {
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($this->xml_obj)),
xml_get_current_line_number($this->xml_obj)));
xml_parser_free($this->xml_obj);
}
}
return true;
}
function startHandler($parser, $name, $attribs){
$_content = array();
if(!empty($attribs))
$_content['attrs'] = $attribs;
array_push($this->output, $_content);
}
function dataHandler($parser, $data){
if(!empty($data) && $data!="\n") {
$_output_idx = count($this->output) - 1;
$this->output[$_output_idx]['content'] .= $data;
}
}
function endHandler($parser, $name){
if(count($this->output) > 1) {
$_data = array_pop($this->output);
$_output_idx = count($this->output) - 1;
$add = array();
if ($_data['attrs'])
$add['attrs'] = $_data['attrs'];
if ($_data['child'])
$add['child'] = $_data['child'];
$this->output[$_output_idx]['child'][$_data['content']] = $add;
}
}
}
?>
Greg S
17-Nov-2005 08:56
If you need utf8_encode support and configure PHP with --disable-all you will have some trouble. Unfortunately the configure options aren't completely documented. If you need utf8 functions and have everything disabled just recompile PHP with --enable-xml and you should be good to go.
compu_global_hyper_mega_net_2 at yahoo dot com
19-Sep-2004 01:35
The documentation regarding white space was never complete I think.
The XML_OPTION_SKIP_WHITE doesn't appear to do anything. I want to preserve the newlines in a cdata section. Setting XML_OPTION_SKIP_WHITE to 0 or false doesn't appear to help. My character_data_handler is getting called once for each line. This obviously should be reflected in the documentation as well. When/how often does the handler get called exactly? Having to build separate test cases is very time consuming.
Inserting newlines myself in my cdata handler is no good either. For non actual CDATA sections that cause my handler to get called, long lines are split up in multiple calls. My handler would not be able to tell the difference whether or not the subsequent calls would be due to the fact that the data is coming from the next line or the fact that some internal buffer is long enough for it to 'flush' out and call the handler.
This behaviour also needs to be properly documented.
odders
18-Mar-2004 10:36
I wrote a simple xml parser mainly to deal with rss version 2. I found lots of examples on the net, but they were all masive and bloated and hard to manipulate.
Output is sent to an array, which holds arrays containg data for each item.
Obviously, you will have to make modifications to the code to suit your needs, but there isnt a lot of code there, so that shouldnt be a problem.
<?php
$currentElements = array();
$newsArray = array();
readXml("./news.xml");
echo("<pre>");
print_r($newsArray);
echo("</pre>");
// Reads XML file into formatted html
function readXML($xmlFile)
{
$xmlParser = xml_parser_create();
xml_parser_set_option($xmlParser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($xmlParser, startElement, endElement);
xml_set_character_data_handler($xmlParser, characterData);
$fp = fopen($xmlFile, "r");
while($data = fread($fp, filesize($xmlFile))){
xml_parse($xmlParser, $data, feof($fp));}
xml_parser_free($xmlParser);
}
// Sets the current XML element, and pushes itself onto the element hierarchy
function startElement($parser, $name, $attrs)
{
global $currentElements, $itemCount;
array_push($currentElements, $name);
if($name == "item"){$itemCount += 1;}
}
// Prints XML data; finds highlights and links
function characterData($parser, $data)
{
global $currentElements, $newsArray, $itemCount;
$currentCount = count($currentElements);
$parentElement = $currentElements[$currentCount-2];
$thisElement = $currentElements[$currentCount-1];
if($parentElement == "item"){
$newsArray[$itemCount-1][$thisElement] = $data;}
else{
switch($name){
case "title":
break;
case "link":
break;
case "description":
break;
case "language":
break;
case "item":
break;}}
}
// If the XML element has ended, it is poped off the hierarchy
function endElement($parser, $name)
{
global $currentElements;
$currentCount = count($currentElements);
if($currentElements[$currentCount-1] == $name){
array_pop($currentElements);}
}
?>
software at serv-a-com dot com
22-Jan-2003 02:08
use:
<?php
while ($data = str_replace("\n","",fread($fp, 4096))){
// ...
}
?>
instead of:
<?php
while ($data = fread($fp, 4096)) {
// ...
}
?>
[UPDATE 17-FEB-2003: This post] resulted in some of the visitors e-mailg me on the carriage return stripping issue with questions. I'll try to make the following mumble as brief and easy to understand as possible.
1. Overview of the 4096 fragmentation issue
As you know the following freads the file 4096 bytes at a time (that is 4KB) this is perhaps ok for testing expat and figuring out how things work, but it it rather dangerous in the production environment. Data may not be fully understandable due to fread fragmentation and improperly formatted due to numerous sources(formats) of data contained within (i.e. end of line delimited CDATA).
<?php
while ($data = fread($fp, 4096)) {
if (!xml_parse($xml_parser, $data, feof($fp))) {
// ...
}
}
?>
Sometimes to save time one may want to load it all up into a one big variable and leave all the worries to expat. I think anything under 500 KB is ok (as long as nobody knows about it). Some may argue that larger variables are acceptable or even necessary because of the magic that take place while parsing using xml_parse. Our XML parser(expat) works and can be successfully implemented only when we know what type of XML data we are dealing with, it's average size and structure of general layout and data contained within tags. For example if the tags are followed by a line delimiter like a new line we can read it with fgets in and with minimal effort make sure that no data will be sent to the function that does not end with a end tag. But this require a fair knowledge of the file's preference for storing XML data and tags (and a bit of code between reading data and xml_parse'ing it).
It will save you a headache.
2. Pre Parser Strings and New Line Delimited Data
One important thing to note at this point is that the xml_parse function requires a string variable. You can manipulate the content of any string variable easily as we all know.
A better approach to removing newlines than:
<?php
while ($data = fread($fp, 4096)) {
$data = preg_replace("/\n|\r/","",$data); //flarp
if (!xml_parse($xml_parser, $data, feof($fp))) {...
?>
Above works across all 3 line-delimited text files (\n, \r, \r\n). But this could potentially (or will most likely) damage or scramble data contained in for example CDATA areas. As far as I am concerned end of line characters should not be used _within_ XML tags. What seems to be the ultimate solution is to pre-parse the loaded data this would require checking the position within the XML document and adding or subtracting (using a in-between fread temporary variable) data based on conditions like: "Is within tag", "Is within CDATA" etc. before fedding it to the parser. This of course opens up a new can of worms (as in parse data for the parser...). (above procedure would take place between fread and xml_parser calls this method would be compatible with the general usage examples on top of the page)
3. The Answer to parsing arbitrary XML and Preprocessor Revisited
You can't just feed any XML document to the parser you constructed and assuming that it will work! You have to know what kind of methods for storing data are used, for example is there a end of line delimited data in the file ?, Are there any carriage returns in the tags etc... XML files come formatted in different ways some are just a one long string of characters with out any end of line markers others have newlines, carriage returns or both (Microsloth Windows). May or may not contain space and other whitespace between tags. For this reason it is important to what I call Normalize the data before feeding it to the parser. You can perform this with regular expressions or plain old str_replace and concatenation. In many cases this can be done to the file it self sometimes to string data on the fly( as shown in the example above). But I feel it is important to normalize the data before even calling the function to call xml_parse. If you have the ability to access all data before that call you can convert it to what you fell the data should have been in the first place and omit many surprises and expensive regular expression substitution (in a tight spot) while fread'ing the data.
guy at bhaktiandvedanta dot com
27-Sep-2002 12:01
For a simple XML parser you can use this function. It doesn't require any extensions to run.
<?php
// Extracts content from XML tag
function GetElementByName ($xml, $start, $end) {
global $pos;
$startpos = strpos($xml, $start);
if ($startpos === false) {
return false;
}
$endpos = strpos($xml, $end);
$endpos = $endpos+strlen($end);
$pos = $endpos;
$endpos = $endpos-$startpos;
$endpos = $endpos - strlen($end);
$tag = substr ($xml, $startpos, $endpos);
$tag = substr ($tag, strlen($start));
return $tag;
}
// Open and read xml file. You can replace this with your xml data.
$file = "data.xml";
$pos = 0;
$Nodes = array();
if (!($fp = fopen($file, "r"))) {
die("could not open XML input");
}
while ($getline = fread($fp, 4096)) {
$data = $data . $getline;
}
$count = 0;
$pos = 0;
// Goes throw XML file and creates an array of all <XML_TAG> tags.
while ($node = GetElementByName($data, "<XML_TAG>", "</XML_TAG>")) {
$Nodes[$count] = $node;
$count++;
$data = substr($data, $pos);
}
// Gets infomation from tag siblings.
for ($i=0; $i<$count; $i++) {
$code = GetElementByName($Nodes[$i], "<Code>", "</Code>");
$desc = GetElementByName($Nodes[$i], "<Description>", "</Description>");
$price = GetElementByName($Nodes[$i], "<BasePrice>", "</BasePrice>");
}
?>
Hope this helps! :)
Guy Laor
dmarsh dot NO dot SPAM dot PLEASE at spscc dot ctc dot edu
18-Sep-2002 12:27
Some reference code I am working on as "XML Library" of which I am folding it info an object. Notice the use of the DEFINE:
Mainly Example 1 and parts of 2 & 3 re-written as an object:
--- MyXMLWalk.lib.php ---
<?php
if (!defined("PHPXMLWalk")) {
define("PHPXMLWalk",TRUE);
class XMLWalk {
var $p; //short for xml parser;
var $e; //short for element stack/array
function prl($x,$i=0) {
ob_start();
print_r($x);
$buf=ob_get_contents();
ob_end_clean();
return join("\n".str_repeat(" ",$i),split("\n",$buf));
}
function XMLWalk() {
$this->p = xml_parser_create();
$this->e = array();
xml_parser_set_option($this->p, XML_OPTION_CASE_FOLDING, true);
xml_set_element_handler($this->p, array(&$this, "startElement"), array(&$this, "endElement"));
xml_set_character_data_handler($this->p, array(&$this, "dataElement"));
register_shutdown_function(array(&$this, "free")); // make a destructor
}
function startElement($parser, $name, $attrs) {
if (count($attrs)>=1) {
$x = $this->prl($attrs, $this->e[$parser]+6);
} else {
$x = "";
}
print str_repeat(" ",$this->e[$parser]+0). "$name $x\n";
$this->e[$parser]++;
$this->e[$parser]++;
}
function dataElement($parser, $data) {
print str_repeat(" ",$this->e[$parser]+0). htmlspecialchars($data, ENT_QUOTES) ."\n";
}
function endElement($parser, $name) {
$this->e[$parser]--;
$this->e[$parser]--;
}
function parse($data, $fp) {
if (!xml_parse($this->p, $data, feof($fp))) {
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($this->p)),
xml_get_current_line_number($this->p)));
}
}
function free() {
xml_parser_free($this->p);
}
} // end of class
} // end of define
?>
--- end of file ---
Calling code:
<?php
...
require("MyXMLWalk.lib.php");
$file = "x.xml";
$xme = new XMLWalk;
if (!($fp = fopen($file, "r"))) {
die("could not open XML input");
}
while ($data = fread($fp, 4096)) {
$xme->parse($data, $fp);
}
...
?>
jon at gettys dot org
14-Aug-2002 01:59
[Editor's note: see also xml_parse_into_struct().]
Very simple routine to convert an XML file into a PHP structure. $obj->xml contains the resulting PHP structure. I would be interested if someone could suggest a cleaner method than the evals I am using.
<?php
$filename = 'sample.xml';
$obj->tree = '$obj->xml';
$obj->xml = '';
function startElement($parser, $name, $attrs) {
global $obj;
// If var already defined, make array
eval('$test=isset('.$obj->tree.'->'.$name.');');
if ($test) {
eval('$tmp='.$obj->tree.'->'.$name.';');
eval('$arr=is_array('.$obj->tree.'->'.$name.');');
if (!$arr) {
eval('unset('.$obj->tree.'->'.$name.');');
eval($obj->tree.'->'.$name.'[0]=$tmp;');
$cnt = 1;
}
else {
eval('$cnt=count('.$obj->tree.'->'.$name.');');
}
$obj->tree .= '->'.$name."[$cnt]";
}
else {
$obj->tree .= '->'.$name;
}
if (count($attrs)) {
eval($obj->tree.'->attr=$attrs;');
}
}
function endElement($parser, $name) {
global $obj;
// Strip off last ->
for($a=strlen($obj->tree);$a>0;$a--) {
if (substr($obj->tree, $a, 2) == '->') {
$obj->tree = substr($obj->tree, 0, $a);
break;
}
}
}
function characterData($parser, $data) {
global $obj;
eval($obj->tree.'->data=\''.$data.'\';');
}
$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
if (!($fp = fopen($filename, "r"))) {
die("could not open XML input");
}
while ($data = fread($fp, 4096)) {
if (!xml_parse($xml_parser, $data, feof($fp))) {
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xml_parser)),
xml_get_current_line_number($xml_parser)));
}
}
xml_parser_free($xml_parser);
print_r($obj->xml);
return 0;
?>
hans dot schneider at bbdo-interone dot de
24-Jan-2002 08:43
I had to TRIM the data when I passed one large String containig a wellformed XML-File to xml_parse. The String was read by CURL, which aparently put a BLANK at the end of the String. This BLANK produced a "XML not wellformed"-Error in xml_parse!
sam at cwa dot co dot nz
28-Sep-2000 07:39
I've discovered some unusual behaviour in this API when ampersand entities are parsed in cdata; for some reason the parser breaks up the section around the entities, and calls the handler repeated times for each of the sections. If you don't allow for this oddity and you are trying to put the cdata into a variable, only the last part will be stored.
You can get around this with a line like:
$foo .= $cdata;
If the handler is called several times from the same tag, it will append them, rather than rewriting the variable each time. If the entire cdata section is returned, it doesn't matter.
May happen for other entities, but I haven't investigated.
Took me a while to figure out what was happening; hope this saves someone else the trouble.
Daniel dot Rendall at btinternet dot com
07-Jul-1999 10:21
When using the XML parser, make sure you're not using the magic quotes option (e.g. use set_magic_quotes_runtime(0) if it's not the compiled default), otherwise you'll get 'not well-formed' errors when dealing with tags with attributes set in them.