PHP xml _set _processing _instruction _handler () Function
Description
The xml_set_processing_instruction_handler() function specifies a function to be called when the parser finds a processing instruction in the XML document.
A processing instruction is enclosed in <? and ?> delimiters and contains a a target followed by data.
Syntax
PHP xml_set_processing_instruction_handler() Function has the following syntax.
xml_set_processing_instruction_handler(parser,handler)Parameter
| Parameter | Is Required | Description |
|---|---|---|
| parser | Required. | XML parser to use |
| handler | Required. | A function to be when the parser finds a notation declaration |
The Function specified by the "handler" parameter must have three parameters:
| Parameter | is Required | Description |
|---|---|---|
| parser | Required. | A variable containing the XML parser calling the handler |
| target | Required. | A variable containing processing instruction target |
| data | Required. | A variable containing processing instruction data |
Return
This function returns TRUE on success, or FALSE on failure.
Example
XML File
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet href="default.xsl" type="text/xml"?>
<Book>/*from w ww . j a va 2 s . co m*/
<name>PHP</name>
<name>Java</name>
</Book>
Specify a function to be called when the parser finds a processing instruction in the XML document
<?php // www . j av a2s .com
$parser=xml_parser_create();
function char($parser,$data){
echo $data;
}
function pi_handler($parser, $target, $data){
echo "Target: $target";
echo "Data: $data ";
}
xml_set_character_data_handler($parser,"char");
xml_set_processing_instruction_handler($parser, "pi_handler");
$fp=fopen("test.xml","r");
while ($data=fread($fp,4096)){
xml_parse($parser,$data,feof($fp)) or
die (sprintf("XML Error: %s at line %d", xml_error_string(xml_get_error_code($parser)),
xml_get_current_line_number($parser))
);
}
xml_parser_free($parser);
?>