<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.xml-set-external-entity-ref-handler" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>xml_set_external_entity_ref_handler</refname>
  <refpurpose>Set up external entity reference handler</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>true</type><methodname>xml_set_external_entity_ref_handler</methodname>
   <methodparam><type>XMLParser</type><parameter>parser</parameter></methodparam>
   <methodparam><type>callable</type><parameter>handler</parameter></methodparam>
  </methodsynopsis>
  <para>
   Sets the external entity reference handler function for the XML parser
   <parameter>parser</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &xml.parser.param;
    <varlistentry>
     <term><parameter>handler</parameter></term>
     <listitem>
      &xml.handler.description;
      <para>
       The signature of the handler must be:
       <methodsynopsis>
        <type>bool</type><methodname><replaceable>handler</replaceable></methodname>
        <methodparam><type>XMLParser</type><parameter>parser</parameter></methodparam>
        <methodparam><type>string</type><parameter>open_entity_names</parameter></methodparam>
        <methodparam><type class="union"><type>string</type><type>false</type></type><parameter>base</parameter></methodparam>
        <methodparam><type>string</type><parameter>system_id</parameter></methodparam>
        <methodparam><type class="union"><type>string</type><type>false</type></type><parameter>public_id</parameter></methodparam>
       </methodsynopsis>
       <variablelist>
        &xml.handler.parser.param;
        <varlistentry>
         <term><parameter>open_entity_names</parameter></term>
         <listitem>
          <simpara>
           A space-separated list of the names of the entities that are open for
           the parse of this entity (including the name of the referenced
           entity).
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>base</parameter></term>
         <listitem>
          <simpara>
           This is the base for resolving the system identifier
           (<parameter>system_id</parameter>) of the external entity.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>system_id</parameter></term>
         <listitem>
          <simpara>
           The system identifier as specified in the entity declaration.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>public_id</parameter></term>
         <listitem>
          <simpara>
           The public identifier as specified in the entity declaration, or
           an empty string if none was specified; the whitespace in the
           public identifier will have been normalized as required by
           the XML spec.
          </simpara>
         </listitem>
        </varlistentry>
       </variablelist>
      </para>
      <para>
       The handler should return &true; if the entity was handled,
       &false; otherwise.
       When returning &false; the XML parser will stop parsing and
       <function>xml_get_error_code</function> will return
       <constant>XML_ERROR_EXTERNAL_ENTITY_HANDLING</constant>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.true.always;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
      &xml.changelog.parser-param;
     <row>
      <entry>7.3.0</entry>
      <entry>
       The return value of the <parameter>handler</parameter> is no longer
       ignored if the extension has been built against libxml. Formerly, the return
       value has been ignored, and parsing did never stop.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

</refentry>
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