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PHP Quiz PHP CertificatePHP xml_set_processing_instruction_handler() Function
Complete PHP XML Reference
Definition and Usage
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.
Example: In this case the processing instruction associates a style sheet with an XML document:
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet href="default.xsl" type="text/xml"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
<?xml-stylesheet href="default.xsl" type="text/xml"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
This function returns TRUE on success, or FALSE on failure.
Syntax
xml_set_processing_instruction_handler(parser,handler)
| Parameter | Description |
|---|---|
| parser | Required. Specifies XML parser to use |
| handler | Required. Specifies a function to be when the parser finds a notation declaration |
The Function specified by the "handler" parameter must have three parameters:
| Parameter | Description |
|---|---|
| parser | Required. Specifies a variable containing the XML parser calling the handler |
| target | Required. Specifies a variable containing processing instruction target |
| data | Required. Specifies a variable containing processing instruction data |
Tips and Notes
Note: The handler parameter can also be an array containing an object reference and a method name.
Example
<?php
$parser=xml_parser_create();
function char($parser,$data)
{
echo $data;
}
function pi_handler($parser, $target, $data)
{
echo "Target: $target<br />";
echo "Data: $data<br />";
}
xml_set_character_data_handler($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($parser);
?>
function char($parser,$data)
{
echo $data;
}
function pi_handler($parser, $target, $data)
{
echo "Target: $target<br />";
echo "Data: $data<br />";
}
xml_set_character_data_handler($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);
?>
Complete PHP XML Reference
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