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<refentry xml:id="function.xml-parser-set-option" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>xml_parser_set_option</refname>
  <refpurpose>Set options in an XML parser</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>xml_parser_set_option</methodname>
   <methodparam><type>XMLParser</type><parameter>parser</parameter></methodparam>
   <methodparam><type>int</type><parameter>option</parameter></methodparam>
   <methodparam><type class="union"><type>string</type><type>int</type><type>bool</type></type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   Sets an option in an XML parser.
  </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 an option in.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>option</parameter></term>
     <listitem>
      <para>
       Which option to set.  See below.
      </para>
      <para>
       The following options are available:
       <table>
        <title>XML parser options</title>
        <tgroup cols="3">
         <thead>
          <row>
           <entry>Option constant</entry>
           <entry>Data type</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry><constant>XML_OPTION_CASE_FOLDING</constant></entry>
           <entry>bool</entry>
           <entry>
            Controls whether <link
            linkend="xml.case-folding">case-folding</link> is enabled for this
            XML parser.  Enabled by default.
           </entry>
          </row>
          <row>
           <entry><constant>XML_OPTION_SKIP_TAGSTART</constant></entry>
           <entry>integer</entry> 
           <entry>
            Specify how many characters should be skipped in the beginning of a
            tag name.
           </entry>
          </row>
          <row>
           <entry><constant>XML_OPTION_SKIP_WHITE</constant></entry>
           <entry>bool</entry>
           <entry>
            Whether to skip values consisting of whitespace characters.
           </entry>
          </row>
          <row>
           <entry><constant>XML_OPTION_TARGET_ENCODING</constant></entry>
           <entry>string</entry> 
           <entry>
            Sets which <link linkend="xml.encoding">target encoding</link> to
            use in this XML parser.By default, it is set to the same as the
            source encoding used by <function>xml_parser_create</function>.
            Supported target encodings are <literal>ISO-8859-1</literal>,
            <literal>US-ASCII</literal> and <literal>UTF-8</literal>.
           </entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       The option's new value.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; on success or &false; on failure.
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   Throws a <classname>ValueError</classname> when an invalid value is passed
   to <parameter>option</parameter>.
  </para>
  <para>
   Prior to PHP 8.0.0, the function returned false when passing an invalid
   value to
   <parameter>option</parameter> generated a <constant>E_WARNING</constant>
   as well as making the function return &false;.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.3.0</entry>
      <entry>
       The <parameter>value</parameter> parameter now also accepts booleans.
       The options <constant>XML_OPTION_CASE_FOLDING</constant> and <constant>XML_OPTION_SKIP_WHITE</constant>
       are now boolean options.
      </entry>
     </row>
     &xml.changelog.parser-param;
     <row>
      <entry>8.0.0</entry>
      <entry>
       A <classname>ValueError</classname> is now thrown if
       <parameter>option</parameter> is invalid.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

</refentry>
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