PHP: Set the scheme handlers for the XSLT processor

Description

void xslt_set_scheme_handlers ( resource $xh , array $handlers )

Registers the scheme handlers (XPath handlers) for the document.

Parameters

xh

The XSLT processor link identifier, created with xslt_create().

handlers

An array with the following keys: "get_all", "open", "get", "put", and "close".

Every entry must be a function name or an array in the following format: array($obj, "method").

Note that the given array does not need to contain all of the different scheme handler elements (although it can), but it only needs to conform to the "handler" => "function" format described above.

Each of the individual scheme handler functions called are in the formats below:

string   get_all(resource processor, string scheme, string rest)
resource open(resource processor, string scheme, string rest)
int      get(resource processor, resource fp, string &data)
int      put(resource processor, resource fp, string data)
void     close(resource processor, resource fp)

Return Values

No value is returned.

Examples

Example #1 xslt_set_scheme_handlers() example

For example, here is an implementation of the "file_exists()" PHP function.


<?php



// Definition of the handler

function mySchemeHandler($processor, $scheme, $rest)

{

    $rest = substr($rest,1);    // to remove the first / automatically added by the engine

    if ($scheme == 'file_exists') {

        // result is embedded in a small xml string

        return '<?xml version="1.0" encoding="UTF-8"?><root>' . (file_exists($rest) ? 'true' : 'false') . '</root>';

    }

}



$SchemeHandlerArray = array('get_all' => 'mySchemeHandler');



// Start the engine

$params = array();

$xh = xslt_create();



xslt_set_scheme_handlers($xh, $SchemeHandlerArray);



$result = xslt_process($xh, "myFile.xml", "myFile.xsl", NULL, array(), $params);

xslt_free($xh);



echo $result;



?>

Then, inside the stylesheet, you can test whether a certain file exists with:

<xsl:if test="document('file_exists:anotherXMLfile.xml')/root='true'">
 <!-- The file exist -->
</xsl:if>

xslt_set_scheme_handlers

Description

Parameters

Return Values

Examples

See Also