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<title>Changes the default external entity loader</title>
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<h1 class="refname">libxml_set_external_entity_loader</h1>
<p class="verinfo">(PHP 5 >= 5.4.0)</p><p class="refpurpose"><span class="refname">libxml_set_external_entity_loader</span> — <span class="dc-title">Changes the default external entity loader</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.libxml-set-external-entity-loader-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>libxml_set_external_entity_loader</strong></span>
( <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$resolver_function</code></span>
)</div>
<p class="para rdfs-comment">
Changes the default external entity loader.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.libxml-set-external-entity-loader-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">resolver_function</code></em></span>
<dd>
<p class="para">
A <span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> that takes three arguments. Two strings, a public id
and system id, and a context (an array with four keys) as the third argument.
This callback should return a resource, a string from which a resource can be
opened, or <strong><code>NULL</code></strong>.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.libxml-set-external-entity-loader-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
No value is returned.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.libxml-set-external-entity-loader-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-5440">
<p><strong>Example #1 <span class="function"><strong>libxml_set_external_entity_loader()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$xml </span><span style="color: #007700">= <<<XML<br /></span><span style="color: #DD0000"><!DOCTYPE foo PUBLIC "-//FOO/BAR" "http://example.com/foobar"><br /><foo>bar</foo><br /></span><span style="color: #007700">XML;<br /><br /></span><span style="color: #0000BB">$dtd </span><span style="color: #007700">= <<<DTD<br /></span><span style="color: #DD0000"><!ELEMENT foo (#PCDATA)><br /></span><span style="color: #007700">DTD;<br /><br /></span><span style="color: #0000BB">libxml_set_external_entity_loader</span><span style="color: #007700">(<br /> function (</span><span style="color: #0000BB">$public</span><span style="color: #007700">, </span><span style="color: #0000BB">$system</span><span style="color: #007700">, </span><span style="color: #0000BB">$context</span><span style="color: #007700">) use(</span><span style="color: #0000BB">$dtd</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$public</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$system</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$context</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$f </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"php://temp"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r+"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$f</span><span style="color: #007700">, </span><span style="color: #0000BB">$dtd</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">rewind</span><span style="color: #007700">(</span><span style="color: #0000BB">$f</span><span style="color: #007700">);<br /> return </span><span style="color: #0000BB">$f</span><span style="color: #007700">;<br /> }<br />);<br /><br /></span><span style="color: #0000BB">$dd </span><span style="color: #007700">= new </span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$r </span><span style="color: #007700">= </span><span style="color: #0000BB">$dd</span><span style="color: #007700">-></span><span style="color: #0000BB">loadXML</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$dd</span><span style="color: #007700">-></span><span style="color: #0000BB">validate</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
string(10) "-//FOO/BAR"
string(25) "http://example.com/foobar"
array(4) {
["directory"] => NULL
["intSubName"] => NULL
["extSubURI"] => NULL
["extSubSystem"] => NULL
}
bool(true)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.libxml-set-external-entity-loader-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.libxml-disable-entity-loader.html" class="function" rel="rdfs-seeAlso">libxml_disable_entity_loader()</a> - Disable the ability to load external entities</span></li>
</ul>
</p>
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