Php/docs/function.libxml-set-external-entity-loader

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libxml_set_external_entity_loader

(PHP 5 >= 5.4.0, PHP 7)

libxml_set_external_entity_loaderChanges the default external entity loader


Description

libxml_set_external_entity_loader ( callable|null $resolver_function ) : bool

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

Returns TRUE on success or FALSE on failure.


Examples

Example #1 libxml_set_external_entity_loader() example

<?php$xml = <<<XML<!DOCTYPE foo PUBLIC "-//FOO/BAR" "http://example.com/foobar%22><foo>bar</foo>XML;$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)

See Also