(PHP 5)
DOMDocument::createProcessingInstruction — Creates new PI node
$target
[, string $data
] )This function creates a new instance of class DOMProcessingInstruction. 此节点出现在文档中，除非是用诸如 DOMNode->appendChild() 等函数来将其插入。
target
The target of the processing instruction.
data
The content of the processing instruction.
The new DOMProcessingInstruction or FALSE if an error occurred.
DOM_INVALID_CHARACTER_ERR
Raised if target contains an invalid character.
romain at supinfo dot com (2009-02-03 11:57:30)
A use exemple of this method :
Usefull for generating an XML linked with a XSLT !
<?php
// "Create" the document.
$xml = new DOMDocument( "1.0", "ISO-8859-15" );
//to have indented output, not just a line
$xml->preserveWhiteSpace = false;
$xml->formatOutput = true;
// ------------- Interresting part here ------------
//creating an xslt adding processing line
$xslt = $xml->createProcessingInstruction('xml-stylesheet', 'type="text/xsl" href="base.xsl"');
//adding it to the xml
$xml->appendChild($xslt);
// ----------- / Interresting part here -------------
//adding some elements
$root = $xml->createElement("list");
$node = $xml->createElement("contact", "John Doe");
$root-> appendChild($node);
$xml-> appendChild($root);
//creating the file
$xml-> save("output.xml");
?>
output.xml :
<?xml version="1.0" encoding="ISO-8859-15"?>
<?xml-stylesheet type="text/xsl" href="base.xsl"?> //the line has been created successfully
<list>
<contact>John Doe</contact>
</list>