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Digg XMLReader functionsThe XMLReader extension is an XML Pull parser. The reader acts as a cursor going forward on the document stream and stopping at each node on the way. It is important to note that internally, libxml uses the UTF-8 encoding and as such, the encoding of the retrieved contents will always be in UTF-8 encoding.
The XMLReader extension is available in PECL as of PHP 5.0.0 and is
included and enabled as of PHP 5.1.0 by default. It can be enabled
by adding the argument
Table 339.
The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
Warning:
XMLReader uses class constants since PHP 5.1. Prior releases use global
constants in the form Table 340. XMLReader Node Types
Table 341. XMLReader Parser Options
Table of Contents
Code Examples / Notes » ref.xmlreaderorion
Some more documentation (i.e. examples) would be nice :-) This is how I read some mysql parameters in an xml file: <?php $xml = new XMLReader(); $xml->open("config.xml"); $xml->setParserProperty(2,true); // This seems a little unclear to me - but it worked :) while ($xml->read()) { switch ($xml->name) { case "mysql_host": $xml->read(); $conf["mysql_host"] = $xml->value; $xml->read(); break; case "mysql_username": $xml->read(); $conf["mysql_user"] = $xml->value; $xml->read(); break; case "mysql_password": $xml->read(); $conf["mysql_pass"] = $xml->value; $xml->read(); break; case "mysql_database": $xml->read(); $conf["mysql_db"] = $xml->value; $xml->read(); break; } } $xml->close(); ?> The XML file used: <?xml version='1.0'?> <MySQL_INIT> <mysql_host>localhost</mysql_host> <mysql_database>db_database</mysql_database> <mysql_username>root</mysql_username> <mysql_password>password</mysql_password> </MySQL_INIT> ariel gonzalez
Simple function I used while playing around with XMLReader. <?php function dump_xmlreader($o) { $node_types = array ( 0=>"No node type", 1=>"Start element", 2=>"Attribute node", 3=>"Text node", 4=>"CDATA node", 5=>"Entity Reference node", 6=>"Entity Declaration node", 7=>"Processing Instruction node", 8=>"Comment node", 9=>"Document node", 10=>"Document Type node", 11=>"Document Fragment node", 12=>"Notation node", 13=>"Whitespace node", 14=>"Significant Whitespace node", 15=>"End Element", 16=>"End Entity", 17=>"XML Declaration node" ); echo "attributeCount = " . $o->attributeCount . "\n"; echo "baseURI = " . $o->baseURI . "\n"; echo "depth = " . $o->depth . "\n"; echo "hasAttributes = " . ( $o->hasAttributes ? 'TRUE' : 'FALSE' ) . "\n"; echo "hasValue = " . ( $o->hasValue ? 'TRUE' : 'FALSE' ) . "\n"; echo "isDefault = " . ( $o->isDefault ? 'TRUE' : 'FALSE' ) . "\n"; echo "isEmptyElement = " . ( @$o->isEmptyElement ? 'TRUE' : 'FALSE' ) . "\n"; echo "localName = " . $o->localName . "\n"; echo "name = " . $o->name . "\n"; echo "namespaceURI = " . $o->namespaceURI . "\n"; echo "nodeType = " . $o->nodeType . ' - ' . $node_types[$o->nodeType] . "\n"; echo "prefix = " . $o->prefix . "\n"; echo "value = " . $o->value . "\n"; echo "xmlLang = " . $o->xmlLang . "\n"; } ?> usedsk
I found it a little hard to parse nested elements, so wrote a function simplifies it (based off http://www.thescripts.com/forum/thread627281.html): <?php function read_mixed_xml($filename, $arrayBeginElem, $arrayEndElem) { $output = ""; $arrayBeginKeys = array_keys($arrayBeginElem); $lengthBegin = count($arrayBeginElem); // Length of the begin array $arrayEndKeys = array_keys($arrayEndElem); $lengthEnd = count($arrayEndElem); // Length of end element array $xmlReader = new XMLReader(); $xmlReader->open($filename); $xmlReader->read(); // Skip root node /* Go through the nodes */ while($xmlReader->read()) { /* We're only parsing begin and #text nodes right now */ if($xmlReader->nodeType != XMLReader::END_ELEMENT) { switch($xmlReader->nodeType) { /* If the current node is a begin element, go through the array of begin elements, in search of the current node's name. If it is, append $arrayBeginElem's value for the current node's name to the $output. (Simulates case "paragraph": $output .= " " break; ) */ case XMLReader::ELEMENT: for($i = 0; $i < $lengthBegin; $i++) { $key = $arrayBeginKeys[i]; if($key==$xmlReader->name) { $output .= $arrayBeginElem[$key]; } } break; /* If the current node is a #text node, append the node's value to $output */ case XMLReader::TEXT: $output .= $xmlReader->value; break; } } /* If the current node is an end element, go through the array of end elements, and search for the current node's name. If found, append $arrayEndElem's value for the current node's name to the output */ else if($xmlReader->nodeType == XMLReader::END_ELEMENT) { for($i = 0; $i < $lengthEnd; $i++) { $key = $arrayEndKeys[i]; if($key==$xmlReader->name) { $output .= $arrayEndElem[$key]; } } } } $xmlReader->close(); return $output; } Example input: $begin = array("title" => " <h1>", "paragraph" => " ", "italicized" => "<i>"); $end = array("title" => "</h1>", "paragraph" => "", "italicized" => "</i>"); $content = read_mixed_xml("index.xml", $begin, $end); echo $content; ?> index.xml: <?xml version="1.0"?> <body> <title>Introduction</title> <paragraph> Lorem <italicized>ipsum dolor sit amet</italicized>, consectetuer adipiscing elit. Donec neque augue, nonummy sit amet, interdum vitae, egestas a, nulla. Aenean sed turpis eget lacus venenatis tincidunt. Integer in leo vitae est euismod congue. Curabitur quis tellus ut nulla pharetra fringilla. Phasellus id risus sagittis turpis lobortis pretium. </paragraph> <paragraph> Curabitur ultrices pulvinar massa. Nullam ac massa. Morbi adipiscing pharetra est. In non neque vitae massa adipiscing vestibulum. Integer congue, lacus non sagittis consectetuer, magna nisl eleifend nisl, id fringilla justo justo et arcu. </paragraph> </body> Example output: <h1>Introduction</h1> Lorem <i>ipsum dolor sit amet</i>, consectetuer adipiscing elit. Donec neque augue, nonummy sit amet, interdum vitae, egestas a, nulla. Aenean sed turpis eget lacus venenatis tincidunt. Integer in leo vitae est euismod congue. Curabitur quis tellus ut nulla pharetra fringilla. Phasellus id risus sagittis turpis lobortis pretium. Curabitur ultrices pulvinar massa. Nullam ac massa. Morbi adipiscing pharetra est. In non neque vitae massa adipiscing vestibulum. Integer congue, lacus non sagittis consectetuer, magna nisl eleifend nisl, id fringilla justo justo et arcu. jamespic
Example, as requested, with nested nodes. <?php ob_start(); ?> <root> <folder> <name>folder A</name> <files> <file> <name>Afile 1</name> </file> <file> <name>Afile 2</name> </file> </files> </folder> <folder> <name>folder B</name> <files> <file> <name>Bfile 1</name> </file> <file> <name>Bfile 2</name> </file> </files> </folder> </root> <?php $xmldata = ob_get_contents(); ob_end_clean(); $xml = new XMLReader(); $xml->XML($xmldata); $data = array(); while ($xml->read()) { while($xml->depth<=2 && $xml->nodeType==1) $xml->read(); if ($xml->nodeType==3 && $xml->depth==3) // NodeType 3 : Text Element { $strFolderName = $xml->value; $data[$strFolderName]=array(); while($xml->depth<=3) $xml->read(); while($xml->depth>=3) { //xdump(); if ($xml->nodeType==3) $data[$strFolderName][] = $xml->value; $xml->read(); } } } print_r($data); echo "\n"; ?> Output : Array ( [folder A] => Array ( [0] => Afile 1 [1] => Afile 2 ) [folder B] => Array ( [0] => Bfile 1 [1] => Bfile 2 ) ) jcatalaa
DTD Validation Parser properties can be set using: $xml_reader->setParserProperty(XMLReader::CONSTANT_NAME, BoolenValue); The constant setting in the xmlreader_validatedtd.php example that comes with the xmlread package results in an error. Here is how I got it to work... <?php $indent = 5; /* Number of spaces to indent per level */ $xml = new XMLReader(); $xml->open("dtdexample.xml"); // CHANGED NEXT TWO LINES TO REMOVE ERROR // FROM: $xml->setParserProperty(XMLREADER_LOADDTD, TRUE); $xml->setParserProperty(XMLReader::LOADDTD, TRUE); $xml->setParserProperty(XMLReader::VALIDATE, TRUE); while($xml->read()) { /* Print node name indenting it based on depth and $indent var */ print str_repeat(" ", $xml->depth * $indent).$xml->name."\n"; if ($xml->hasAttributes) { $attCount = $xml->attributeCount; print str_repeat(" ", $xml->depth * $indent)." Number of Attributes: ".$xml->attributeCount."\n"; } } print "\n\nValid:\n"; var_dump($xml->isValid()); ?> |
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