Mail obfuscator

mail-obfuscator.php

<?php

/**
 * Mail obfuscation
 * Original function as in @see except for the $text argument 
 * @see http://www.maurits.vdschee.nl/php_hide_email/
 */
function hide_email($email, $text = '') {
    $character_set = '+-.0123456789@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';
    $key = str_shuffle($character_set);
    $cipher_text = '';
    $id = 'e'.rand(1,999999999);

    for ( $i = 0; $i < strlen($email); $i += 1 )
        $cipher_text.= $key[ strpos($character_set, $email[$i]) ];

    $script = 'var a="'.$key.'";var b=a.split("").sort().join("");var c="'.$cipher_text.'";var d="";';
    $script.= 'for(var e=0;e<c.length;e++)d+=b.charAt(a.indexOf(c.charAt(e)));';
    $script.= 'document.getElementById("'.$id.'").innerHTML="<a href=\\"mailto:"+d+"\\">'.(empty($text)?'"+d+"':$text).'</a>"';
    $script = "eval(\"".str_replace(array("\\",'"'),array("\\\\",'\"'), $script)."\")";
    $script = '<script type="text/javascript">/*<![CDATA[*/'.$script.'/*]]>*/</script>';

    return '<span id="'.$id.'">[javascript protected email address]</span>'.$script;
}