<?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>bool</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>
    <varlistentry>
     <term><parameter>parser</parameter></term>
     <listitem>
      <para>
       A reference to the XML parser to set up external entity reference handler function.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>handler</parameter></term>
     <listitem>
      <para>
       <parameter>handler</parameter> is a string containing the name of a
       function that must exist when <function>xml_parse</function> is called
       for <parameter>parser</parameter>.
      </para>
      <para>
       The function named by <parameter>handler</parameter> must accept
       five parameters, and should return an integer value.If the
       value returned from the handler is &false; (which it will be if no
       value is returned), the XML parser will stop parsing and
       <function>xml_get_error_code</function> will return
       <constant>XML_ERROR_EXTERNAL_ENTITY_HANDLING</constant>.
       <methodsynopsis>
        <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>string</type><parameter>base</parameter></methodparam>
        <methodparam><type>string</type><parameter>system_id</parameter></methodparam>
        <methodparam><type>string</type><parameter>public_id</parameter></methodparam>
       </methodsynopsis>
       <variablelist>
        <varlistentry>
         <term><parameter>parser</parameter></term>
         <listitem>
          <simpara>
           The first parameter, <replaceable>parser</replaceable>, is a
           reference to the XML parser calling the handler.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>open_entity_names</parameter></term>
         <listitem>
          <simpara>
           The second parameter, <parameter>open_entity_names</parameter>, is 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.Currently
           this parameter will always be set to an empty string.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>system_id</parameter></term>
         <listitem>
          <simpara>
           The fourth parameter, <parameter>system_id</parameter>, is the
           system identifier as specified in the entity declaration.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>public_id</parameter></term>
         <listitem>
          <simpara>
           The fifth parameter, <parameter>public_id</parameter>, is 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>
       If a handler function is set to an empty string, or &false;, the handler
       in question is disabled.
      </para>
      &note.func-callback;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

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