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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
<refentry id="function.html-entity-decode">
<refnamediv>
<refname>html_entity_decode</refname>
<refpurpose>
Convert all HTML entities to their applicable characters
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>string</type><methodname>html_entity_decode</methodname>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>quote_style</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>charset</parameter></methodparam>
</methodsynopsis>
<para>
<function>html_entity_decode</function> is the opposite of
<function>htmlentities</function> in that it converts all HTML entities
to their applicable characters from <parameter>string</parameter>.
</para>
<para>
The optional second <parameter>quote_style</parameter> parameter lets
you define what will be done with 'single' and "double" quotes. It takes
on one of three constants with the default being
<constant>ENT_COMPAT</constant>:
<table>
<title>Available <parameter>quote_style</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>
</tbody>
</tgroup>
</table>
</para>
<para>
The ISO-8859-1 character set is used as default for the optional third
<parameter>charset</parameter>. This defines the character set used in
conversion.
</para>
&reference.strings.charsets;
<para>
<example>
<title>Decoding HTML entities</title>
<programlisting role="php">
<![CDATA[
<?php
$orig = "I'll \"walk\" the <b>dog</b> now";
$a = htmlentities($orig);
$b = html_entity_decode($a);
echo $a; // I'll "walk" the <b>dog</b> now
echo $b; // I'll "walk" the <b>dog</b> now
// For users prior to PHP 4.3.0 you may do this:
function unhtmlentities($string)
{
$trans_tbl = get_html_translation_table(HTML_ENTITIES);
$trans_tbl = array_flip($trans_tbl);
return strtr($string, $trans_tbl);
}
$c = unhtmlentities($a);
echo $c; // I'll "walk" the <b>dog</b> now
?>
]]>
</programlisting>
</example>
</para>
<para>
<note>
<para>
You might wonder why trim(html_entity_decode('&nbsp;')); doesn't
reduce the string to an empty string, that's because the '&nbsp;'
entity is not ASCII code 32 (which is stripped by
<function>trim</function>) but ASCII code 160 (0xa0) in the default ISO
8859-1 characterset.
</para>
</note>
</para>
<para>
See also <function>htmlentities</function>,
<function>htmlspecialchars</function>,
<function>get_html_translation_table</function>,
and <function>urldecode</function>.
</para>
</refsect1>
</refentry>
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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
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sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
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