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PHP : Function Reference : XML Parser Functions : xml_set_processing_instruction_handler

xml_set_processing_instruction_handler

Set up processing instruction (PI) handler (PHP 4, PHP 5)
bool xml_set_processing_instruction_handler ( resource parser, callback handler )

Sets the processing instruction (PI) handler function for the XML parser parser.

A processing instruction has the following format:

<?target
data?>

You can put PHP code into such a tag, but be aware of one limitation: in an XML PI, the PI end tag (?>) can not be quoted, so this character sequence should not appear in the PHP code you embed with PIs in XML documents.If it does, the rest of the PHP code, as well as the "real" PI end tag, will be treated as character data.

Parameters

parser
handler

handler is a string containing the name of a function that must exist when xml_parse() is called for parser.

The function named by handler must accept three parameters:

parser
The first parameter, parser, is a reference to the XML parser calling the handler.
target
The second parameter, target, contains the PI target.
data
The third parameter, data, contains the PI data.

If a handler function is set to an empty string, or FALSE, the handler in question is disabled.

Note:

Instead of a function name, an array containing an object reference and a method name can also be supplied.

Return Values

Returns TRUE on success or FALSE on failure.

Examples ( Source code ) xml_set_processing_instruction_handler





<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml
-stylesheet href="default.xsl" type="text/xml"?>
<note>
<to>Tom</to>
<from>Mike</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note><?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);

?>

Related Examples ( Source code ) » xml_set_processing_instruction_handler


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utf8_decode
utf8_encode
xml_error_string
xml_get_current_byte_index
xml_get_current_column_number
xml_get_current_line_number
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xml_parse_into_struct
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xml_parser_create
xml_parser_free
xml_parser_get_option
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xml_set_character_data_handler
xml_set_default_handler
xml_set_element_handler
xml_set_end_namespace_decl_handler
xml_set_external_entity_ref_handler
xml_set_notation_decl_handler
xml_set_object
xml_set_processing_instruction_handler
xml_set_start_namespace_decl_handler
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