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libxml _set _external _entity _loader

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(PHP 5 >= 5.4.0, PHP 7)

libxml_set_external_entity_loader — Changes the default external entity loader

Description

libxml_set_external_entity_loader ( callable $resolver_function ) : bool

Changes the default external entity loader.

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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.

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Return Values

Returns TRUE on success or FALSE on failure.

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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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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-libxml-set-external-entity-loader.html

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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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