PHP Tutorial - PHP xml _set _external _entity _ref _handler () Function

The xml_set_external_entity_ref_handler() function specifies a function to be called when the parser finds an external entity in the XML document.

Syntax

PHP xml_set_external_entity_ref_handler() Function has the following syntax.

xml_set_external_entity_ref_handler(parser,handler)

Parameter

Parameter	Is Required	Description
parser	Required.	XML parser to use
handler	Required.	A function to be called when the parser finds an external entity

The Function specified by the "handler" parameter must have five parameters:

Parameter	Is Required	Description
parser	Required.	A variable containing the XML parser calling the handler
name	Required.	A variable containing the name of the external entity
base	Required.	Base for resolving the system identifier (system_id) of the external entity. Currently, this is always NULL
system_id	Required.	System identifier for the external entity
public_id	Required.	Public identifier for the external entity

Return

This function returns TRUE on success, or FALSE on failure.

Example

XML File

<?xml version="1.0" encoding="ISO-8859-1"?>
<Book>
    <name>PHP</name>
    <name>Java</name>
</Book>

Specifies a function to be called when the parser finds an external entity in the XML document


<?php/* w w w  .  j av a 2 s .  c  o m*/
$parser=xml_parser_create();

function char($parser,$data){
  echo $data;
}

function ext_ent_handler($parser,$ent){
  echo "$ent \n";
}

xml_set_character_data_handler($parser,"char");
xml_set_external_entity_ref_handler($parser, "ext_ent_handler");
$fp=fopen("test.xml","r");

while ($data=fread($fp,1024)){
  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);
?>