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Changes the default external entity loader


libxml_set_external_entity_loader

(PHP 5 >= 5.4.0)

libxml_set_external_entity_loaderChanges the default external entity loader

Description

void libxml_set_external_entity_loader ( callable $resolver_function )

Changes the default external entity loader.

Parameters

resolver_function

A callable that takes three arguments. Two strings, a public id and system id, and a context (an array with four keys) as the third argument. This callback should return a resource, a string from which a resource can be opened, or NULL.

Return Values

No value is returned.

Examples

Example #1 libxml_set_external_entity_loader() example

<?php
$xml 
= <<<XML
<!DOCTYPE foo PUBLIC "-//FOO/BAR" "http://example.com/foobar">
<foo>bar</foo>
XML;

$dtd = <<<DTD
<!ELEMENT foo (#PCDATA)>
DTD;

libxml_set_external_entity_loader(
    function (
$public$system$context) use($dtd) {
        
var_dump($public);
        
var_dump($system);
        
var_dump($context);
        
$f fopen("php://temp""r+");
        
fwrite($f$dtd);
        
rewind($f);
        return 
$f;
    }
);

$dd = new DOMDocument;
$r  $dd->loadXML($xml);

var_dump($dd->validate());
?>

The above example will output:

 string(10) "-//FOO/BAR" string(25) "http://example.com/foobar" array(4) {  ["directory"] => NULL  ["intSubName"] => NULL  ["extSubURI"] => NULL  ["extSubSystem"] => NULL } bool(true) 

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