php-doc-en/reference/strings/functions/htmlspecialchars-decode.xml

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<refentry xml:id="function.htmlspecialchars-decode" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>htmlspecialchars_decode</refname>
  <refpurpose>
   Convert special HTML entities back to characters
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>htmlspecialchars_decode</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>ENT_QUOTES</constant> | <constant>ENT_SUBSTITUTE</constant> | <constant>ENT_HTML401</constant></initializer></methodparam>
  </methodsynopsis>

  <para>
   This function is the opposite of <function>htmlspecialchars</function>. It
   converts special HTML entities back to characters.
  </para>
  <para>
   The converted entities are: <literal>&amp;amp;</literal>,
   <literal>&amp;quot;</literal> (when <constant>ENT_NOQUOTES</constant> is not set),
   <literal>&amp;#039;</literal> (when <constant>ENT_QUOTES</constant> is set),
   <literal>&amp;lt;</literal> and <literal>&amp;gt;</literal>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       The string to decode.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       A bitmask of one or more of the following flags, which specify how to handle quotes and
       which document type to use. The default is <literal>ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401</literal>.
       <table>
        <title>Available <parameter>flags</parameter> constants</title>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>Constant Name</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry><constant>ENT_COMPAT</constant></entry>
           <entry>Will convert double-quotes and leave single-quotes alone.</entry>
          </row>
          <row>
           <entry><constant>ENT_QUOTES</constant></entry>
           <entry>Will convert both double and single quotes.</entry>
          </row>
          <row>
           <entry><constant>ENT_NOQUOTES</constant></entry>
           <entry>Will leave both double and single quotes unconverted.</entry>
          </row>
          <row>
           <entry><constant>ENT_SUBSTITUTE</constant></entry>
           <entry>
            Replace invalid code unit sequences with a Unicode Replacement Character
            U+FFFD (UTF-8) or &amp;#xFFFD; (otherwise) instead of returning an empty string.
           </entry>
          </row>
          <row>
           <entry><constant>ENT_HTML401</constant></entry>
           <entry>
            Handle code as HTML 4.01.
           </entry>
          </row>
          <row>
           <entry><constant>ENT_XML1</constant></entry>
           <entry>
            Handle code as XML 1.
           </entry>
          </row>
          <row>
           <entry><constant>ENT_XHTML</constant></entry>
           <entry>
            Handle code as XHTML.
           </entry>
          </row>
          <row>
           <entry><constant>ENT_HTML5</constant></entry>
           <entry>
            Handle code as HTML 5.
           </entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the decoded string.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.1.0</entry>
      <entry>
       <parameter>flags</parameter> changed from <constant>ENT_COMPAT</constant> to <constant>ENT_QUOTES</constant> | <constant>ENT_SUBSTITUTE</constant> | <constant>ENT_HTML401</constant>.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>htmlspecialchars_decode</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$str = "<p>this -&gt; &quot;</p>\n";

echo htmlspecialchars_decode($str);

// note that here the quotes aren't converted
echo htmlspecialchars_decode($str, ENT_NOQUOTES);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
<p>this -> "</p>
<p>this -> &quot;</p>
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>htmlspecialchars</function></member>
    <member><function>html_entity_decode</function></member>
    <member><function>get_html_translation_table</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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