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(PHP 5 >= 5.4.0)
libxml_set_external_entity_loader — Changes the default external entity loader
$resolver_function
)Changes the default external entity loader.
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
.
没有返回值。
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)