(PHP 5 >= 5.4.0, PHP 7)
Changes the default external entity loader
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
.
Returns:
No value is returned.
Examples:
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)
See also:
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