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Protect your mailto email addresses from bots - pure PHP

Protect your mailto email addresses from bots - pure PHP

After reading an example of how to secure your email on your website from robots, which was incorrect, as it was pure PHP, I decided to give you my function for doing it. 
The code below takes 1 or 2 parameters, the email and the text for the link. If you omit the text, the email address is used. 

<?php 

function secure_email($email, $name=null) 
{ 
    $email_parts=split("@",$email); 
    $email_parts[1]=str_replace(".", ".", $email_parts[1]); 

    if(is_null($name)) 
    { 
        $name='\' + user + \'@\' + site + \''; 
    } 
    else 
    { 
        // change ' to \' to prevent messing up javascript, dont addslashes as only ' needs to be converted 
        $name=str_replace("'", "\'", $name); 
    } 

    $code=""; 
    $code.='<script language="JavaScript">' . "\n"; 
    $code.='<!-- Begin user' . "\n"; 
    $code.='user = "' . $email_parts[0] . '";' . "\n"; 
    $code.='site = "' . $email_parts[1] . '";' . "\n"; 
    $code.='document.write(\'<a href=\\"mailto:\' + user + \'@\' + site + \'\\">\');' . "\n"; 
    $code.='document.write(\'' . $name . '</a>\');' . "\n"; 
    $code.='// End -->' . "\n"; 
    $code.='</script>' . "\n"; 

    return $code; 
} 

?>