urldecode
    (PHP 3, PHP 4 , PHP 5)
urldecode -- Decodes URL-encoded string
Description
string 
urldecode ( string str)
     Decodes any %##
     encoding in the given string.  The decoded string is returned.
     
Example 1. urldecode() example 
<?php $a = explode('&', $QUERY_STRING); $i = 0; while ($i < count($a)) {     $b = split('=', $a[$i]);     echo 'Value for parameter ', htmlspecialchars(urldecode($b[0])),          ' is ', htmlspecialchars(urldecode($b[1])), "<br />\n";     $i++; } ?>
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     See also urlencode(),
     rawurlencode() and
     rawurldecode().