php 编码电子邮件地址

function encode_email($email='[e-mail]', $linkText='Contact Us', $attrs ='class="emailencoder"' )
{
    // remplazar aroba y puntos
    $email = str_replace('@', '@', $email);
    $email = str_replace('.', '.', $email);
    $email = str_split($email, 5); 

    $linkText = str_replace('@', '@', $linkText);
    $linkText = str_replace('.', '.', $linkText);
    $linkText = str_split($linkText, 5); 

    $part1 = '<a href="ma';
    $part2 = 'ilto&#58;';
    $part3 = '" '. $attrs .' >';
    $part4 = '</a>'; 

    $encoded = '<script type="text/javascript">';
    $encoded .= "document.write('$part1');";
    $encoded .= "document.write('$part2');";
    foreach($email as $e)
    {
            $encoded .= "document.write('$e');";
    }
    $encoded .= "document.write('$part3');";
    foreach($linkText as $l)
    {
            $encoded .= "document.write('$l');";
    }
    $encoded .= "document.write('$part4');";
    $encoded .= '</script>'; 

    return $encoded;
}