php-doc-en/reference/url/functions/urldecode.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.urldecode" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>urldecode</refname>
  <refpurpose>Decodes URL-encoded string</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>urldecode</methodname>
   <methodparam><type>string</type><parameter>str</parameter></methodparam>
  </methodsynopsis>
  <para>
   Decodes any <literal>%<replaceable>##</replaceable></literal>
   encoding in the given string. Plus symbols ('<literal>+</literal>') are
   decoded to a space character.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>str</parameter></term>
     <listitem>
      <para>
       The string to be decoded.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

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

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>urldecode</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$query = "my=apples&are=green+and+red";

foreach (explode('&', $query) as $chunk) {
    $param = explode("=", $chunk);

    if ($param) {
        printf("Value for parameter \"%s\" is \"%s\"<br/>\n", urldecode($param[0]), urldecode($param[1]));
    }
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <warning>
   <para>
    The superglobals <varname>$_GET</varname> and <varname>$_REQUEST</varname>
    are already decoded.  Using <function>urldecode</function> on an element
    in <varname>$_GET</varname> or <varname>$_REQUEST</varname> could have
    unexpected and dangerous results.
   </para>
  </warning>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>urlencode</function></member>
    <member><function>rawurlencode</function></member>
    <member><function>rawurldecode</function></member>
    <member><link xlink:href="&url.rfc;3986">RFC 3986</link></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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