libxml_set_external_entity_loader()
(PHP 5 >= 5.4.0, PHP 7)
Changes the default external entity loader
说明
libxml_set_external_entity_loader(callable $resolver_function): bool
Changes the default external entity loader.
参数
- $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
.
返回值
成功时返回TRUE
,或者在失败时返回FALSE
。
范例
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()); ?>
以上例程会输出:
string(10) "-//FOO/BAR" string(25) "http://example.com/foobar" array(4) { ["directory"] => NULL ["intSubName"] => NULL ["extSubURI"] => NULL ["extSubSystem"] => NULL } bool(true)
参见
libxml_disable_entity_loader()
Disable the ability to load external entities