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# xml_set_external_entity_ref_handler

(PHP 3>= 3.0.6, PHP 4 , PHP 5)

xml_set_external_entity_ref_handler -- Set up external entity reference handler

## Description

bool xml_set_external_entity_ref_handler ( resource parser, callback handler)

Sets the external entity reference handler function for the XML parser parser. 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 five parameters, and should return an integer value. If the value returned from the handler is `FALSE` (which it will be if no value is returned), the XML parser will stop parsing and xml_get_error_code() will return XML_ERROR_EXTERNAL_ENTITY_HANDLING. handler ( resource parser, string open_entity_names, string base, string system_id, string public_id)

parser

  The first parameter, parser, is a reference to the XML parser calling the handler.

open_entity_names

  The second parameter, open_entity_names, is a space-separated list of the names of the entities that are open for the parse of this entity (including the name of the referenced entity).

base

  This is the base for resolving the system identifier (system_id) of the external entity. Currently this parameter will always be set to an empty string.

system_id

  The fourth parameter, system_id, is the system identifier as specified in the entity declaration.

public_id

  The fifth parameter, public_id, is the public identifier as specified in the entity declaration, or an empty string if none was specified; the whitespace in the public identifier will have been normalized as required by the XML spec.

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

`TRUE` is returned if the handler is set up, `FALSE` if parser is not a parser.

> 備注:除了函數名稱，也提供一個包含物件參考的陣列和一個方法名稱。

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