note 30510 added to function.xslt-set-scheme-handlers

xslt_set_scheme_handlers is a powerful feature, derived from the Sablotron engine, which can help in various situations. Briefly, it allows you to call any kind of PHP instruction, during the treatment of a stylesheet, through the XSLT document() function. For example, here is an implementation of the "file_exists()" PHP function : // Definition of the handler : function mySchemeHandler($processor, $scheme, $rest) { $rest=substr($rest,1); // to remove the first / automatically added by the engine if($scheme == 'file_exists') return '<?xml version="1.0" encoding="UTF-8"?><root>'.(file_exists($rest) ? "true" : "false")."</root>"; // result is embedded in a small xml string } // Initialisation of the handler (the "get_all" should be work in most cases) : $SchemeHandlerArray = array(); $SchemeHandlerArray["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 $result; Then, inside the stylesheet, you can test whether a certain file exists with : <xsl:if test="document('file_exists:anotherXMLfile.xml’)/root='true'"> < !-- bla bla bla --> </xsl:if> So finally, the principle is simple : - you define a scheme (here, I called it "file_exists") - you write the action associated to that scheme (in the mySchemeHandler function) - you embed the (probable) results in an XML string, that you return. - and in the stylesheet, you check : document('myPersonalURIscheme:myXPath') You can imagine many other uses for the mySchemeHandler() function. My framework is : PHP 4.2.3, Sablotron version 0.96, and Expat 1.95.5 Please note that some older version of PHP might require an additionnal parameter : mySchemeHandler($processor,$scheme,$rest,&$buffer) and you place your XML in $buffer, instead of returning it with return(). Baptiste -- http://www.php.net/manual/en/function.xslt-set-scheme-handlers.php http://master.php.net/manage/user-notes.php?action=edit+30510 http://master.php.net/manage/user-notes.php?action=delete+30510 http://master.php.net/manage/user-notes.php?action=reject+30510