XSLTProcessor::setParameter

(PHP 5)

XSLTProcessor::setParameter — Set value for a parameter

说明

bool XSLTProcessor::setParameter ( string $namespace , string $name , string $value )

bool XSLTProcessor::setParameter ( string $namespace , array $options )

Sets the value of one or more parameters to be used in subsequent transformations with XSLTProcessor. If the parameter doesn't exist in the stylesheet it will be ignored.

参数

namespace: The namespace URI of the XSLT parameter.
name: The local name of the XSLT parameter.
value: The new value of the XSLT parameter.
options: An array of name => value pairs. This syntax is available since PHP 5.1.0.

返回值

成功时返回 TRUE ，或者在失败时返回 FALSE 。

范例

Example #1 Changing the owner before the transformation

  <?php

$collections  = array(
     'Marc Rutkowski'  =>  'marc' ,
     'Olivier Parmentier'  =>  'olivier'
 );

 $xsl  = new  DOMDocument ;
 $xsl -> load ( 'collection.xsl' );

 // Configure the transformer
 $proc  = new  XSLTProcessor ;
 $proc -> importStyleSheet ( $xsl );  // attach the xsl rules

 foreach ( $collections  as  $name  =>  $file ) {
     // Load the XML source
     $xml  = new  DOMDocument ;
     $xml -> load ( 'collection_'  .  $file  .  '.xml' );

     $proc -> setParameter ( '' ,  'owner' ,  $name );
     $proc -> transformToURI ( $xml ,  'file:///tmp/'  .  $file  .  '.html' );
}

 ?>

参见

XSLTProcessor::getParameter() - Get value of a parameter
XSLTProcessor::removeParameter() - Remove parameter

用户评论:

[#1] richard at aggmedia dot net [2009-03-04 19:47:58]

Note that there is no way to remove a parameter from an XSLTProcessor unless you know its name, and there is no way (that I can find) to get a list of the current parameters.

This means that you cannot reuse an XSLTProcessor with different parameters unless you call XSLTProcessor->removeParameter() on every parameter, and to do that you need to know the names of all the currently set parameters.

I bumped into this because we were caching XSLTProcessors for reuse, and they were spitting out content based on phantom parameters (they were still there from previous uses).

[#2] Lennaert van der Linden [2008-02-13 06:28:18]

The parameter will not be set if the value contains both single and double quotes. Instead a warning will be shown when transforming the document:

PHP Warning: XSLTProcessor::transformToXml(): Cannot create XPath expression (string contains both quote and double-quotes)

[#3] brettz9 [2007-05-08 20:27:26]

It seems heinemann's usage is not correct and does not achieve the intended result.

This method's purpose is to change a global <xsl:param> value in the XSL stylesheet--not to change an attribute of any other element.  <xsl:param> basically lets you set up a stylesheet which can be customized (as from PHP) externally (without needing to tamper with the original XSL file).

Here's an example of usage (that will work):

Stylesheet:

<?phpxml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="print_something" select="defaultstring"/>
<xsl:template match="/mydoc">
<p style="color:red;">Printed parameter: <xsl:value-of select="$print_something"/></p>
    </xsl:template>
</xsl:stylesheet>

Script:

<?php $dom = new DOMDocument(); $xsl = new XSLTProcessor; $xsl->setParameter( '', 'print_something', "Now I've overridden the default!"); $style = realpath( "./my_stylesheet.xslt" ); $dom->load($style); $xsl->importStyleSheet($dom); $dom->loadXML('<mydoc></mydoc>'); $out = $xsl->transformToXML( $dom ); var_dump( '<pre>',     htmlentities( $out, ENT_QUOTES, 'utf-8' ),     $xsl->getParameter('', 'print_something'), '</pre>' ); ?>

gives:

string(5) "

"
string(143) "<?phpxml version="1.0"?>
<p style="color:red;">Printed parameter: Now I've overridden the default!</p>
"
string(32) "Now I've overridden the default!"
string(6) "

"

Notice that at present adding a namespace will not work. The only option at present is to set the first parameter for namespace to an empty string (though you can add the prefix with colon to the second argument for name in order to set the parameter for a namespace-prefixed parameter name).

See http://bugs.php.net/bug.php?id=30622

[#4] OrionI [2007-05-01 07:19:14]

After looking at this a little further (see http://bugs.php.net/bug.php?id=41248), it appears that it's a shortcoming of libxslt, not PHP, that prevents passing in DOMDocuments or DOMNodes as parameters.

[#5] Orion I [2007-04-30 20:46:49]

I've been trying to pass in a DOMDocument object as a parameter so I can stuff a bunch of data into XML nodes, but it appears that this function is not capable of it. I was hoping to get it to work like it does in the .NET 2.0 framework. (See http://msdn2.microsoft.com/en-us/library/
system.xml.xsl.xsltargumentlist.addparam.aspx)
But after looking at the PHP 5.2.1 source code, /php-5.2.1/ext/xsl/xsltprocessor.c line 604-650, it appears that it's not possible to do so in PHP even though it appears that libxslt supports it (see http://xmlsoft.org/XSLT/html/libxslt-variables.html
#xsltParseGlobalParam)

In fact, if the parameters aren't exactly what's expected, you'll always get a warning like this:

Wrong parameter count for XSLTProcessor::setParameter()

[#6] heinemann dot juergen at hjcms dot de [2006-03-07 03:39:55]

Example for how it works.

<?phpxml version = '1.0' encoding = 'utf-8' ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml"
indent="yes"
encoding="ISO-8859-15"
doctype-system = "-//W3C//DTD XHTML 1.0 Transitional//EN"
doctype-public = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
/>
<xsl:template match="docs">
<html>
<head>
<title>
<xsl:text>Example</xsl:text>
</title>
</head>
<body>
<xsl:for-each select="block">
<div>
<xsl:value-of select="." />
</div>
</xsl:for-each>
</body>
</html>
</xsl:template>
</xsl:stylesheet>

------------------

<?php $dom = new DomDocument( '1.0', 'utf-8' ); $xsl = new XSLTProcessor; $xsl->setParameter( 'block', 'xmlns', 'http://www.w3.org/1999/xhtml' ); $style = realpath( "./my_stylesheet.xslt" ); $dom->load( $style ); $xsl->importStyleSheet( $dom ); $dom->loadXML( '<docs> <block>Howto set xhtml Transitional Namespaces width php</block> <block>see http://www.php.net</block> </docs>' ); $out = $xsl->transformToXML( $dom ); var_dump( '<pre>', htmlentities( $out, ENT_QUOTES, 'utf-8' ), $xsl->getParameter( 'block', 'xmlns' ), $xsl->getParameter( 'docs', 'xmlns' ), '</pre>' ); ?>

[#7] Stoke A [2005-08-11 15:40:25]

XSLTProcessor::removeParameter() won't work on parameters set via XSLTProcessor::setParameter(string namespace, array options) in 5.1+ -- they need to be set and removed one by one.