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PHP xml_set_processing_instruction_handler() function


Definition and usage

xml_set_processing_instruction_handler () function specifies a function to be called when the parser finds a processing instruction in an XML document.

Processing instructions are contained in <? with ?>Delimiter, and contains a target with data.

Example: In this example, a 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>

If successful, the function returns TRUE. If it fails, it returns FALSE.

Syntax

xml_set_processing_instruction_handler (parser, handler)

parameters description
parser Required. Specifies the XML parser to use.
handler Required. Specifies the function to be called when the parser finds a processing instruction.

The function specified by the "handler" parameter must have three parameters:

parameters description
parser Required. Specifies a variable containing an XML parser that calls the processor.
target Required. Specify a variable containing the processing instruction target.
data Required. Specifies a variable that contains processing instruction data.


Tips and comments

Note: The handler parameter can also be an array containing object references and method names.


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);
?>