(PHP 5, PHP 7, PHP 8)
XSLTProcessor::setParameter — Define um valor para um parâmetro
Define o valor para um ou mais parâmetros para ser usados em transformações subsequentes com XSLTProcessor. Se o parâmetro não existir na folha de estilos, ele será ignorado.
namespaceA URI de espaço de nomes do parâmetro XSLT.
nameO nome local do parâmetro XSLT.
valueO novo valor do parâmetro XSLT.
options
Um array de pares name => value.
Lança uma exceção ValueError se qualquer argumento contiver bytes nulos.
| Versão | Descrição |
|---|---|
| 8.4.0 | Agora lança uma exceção ValueError se qualquer argumento contiver bytes nulos ao invés de truncar silenciosamente. |
| 8.4.0 | Agora é possível definir um valor de parâmetro contendo tanto aspas simples quanto aspas duplas. Antes do PHP 8.4.0, isto resultava em um alerta. |
Exemplo #1 Modificando o parâmetro 'owner' antes da transformação
<?php
$collections = array(
'Marc Rutkowski' => 'marc',
'Olivier Parmentier' => 'olivier'
);
$xsl = new DOMDocument;
$xsl->load('collection.xsl');
// Configura o transformador
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl); // anexa as regras xsl
foreach ($collections as $name => $file) {
// Carrega a fonte XML
$xml = new DOMDocument;
$xml->load('collection_' . $file . '.xml');
$proc->setParameter('', 'owner', $name);
$proc->transformToURI($xml, 'file:///tmp/' . $file . '.html');
}
?>
[EDIT by nielsdos: This is no longer true as of PHP 8.4.0]
The parameter will not be set if the value contains both single and double quotes. Instead a warning will be shown when transforming the document:
PHP Warning: XSLTProcessor::transformToXml(): Cannot create XPath expression (string contains both quote and double-quotes)Note that there is no way to remove a parameter from an XSLTProcessor unless you know its name, and there is no way (that I can find) to get a list of the current parameters.
This means that you cannot reuse an XSLTProcessor with different parameters unless you call XSLTProcessor->removeParameter() on every parameter, and to do that you need to know the names of all the currently set parameters.
I bumped into this because we were caching XSLTProcessors for reuse, and they were spitting out content based on phantom parameters (they were still there from previous uses).It seems heinemann's usage is not correct and does not achieve the intended result.
This method's purpose is to change a global <xsl:param> value in the XSL stylesheet--not to change an attribute of any other element. <xsl:param> basically lets you set up a stylesheet which can be customized (as from PHP) externally (without needing to tamper with the original XSL file).
Here's an example of usage (that will work):
Stylesheet:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="print_something" select="defaultstring"/>
<xsl:template match="/mydoc">
<p style="color:red;">Printed parameter: <xsl:value-of select="$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) "<?xml 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=30622After 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.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()Example for how it works.
<?xml 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>' );
?>