Email Link Obfuscator

This PHP function / jQuery plugin will create an obfuscated mailto link that will protect your email addresses from the spam bots that harvest the web. This is accomplished by:

Base64 encoding the entire href mailto link
Putting the encoded link into the anchor's title
Placing an innocent looking, do nothing "#" into the href
Giving the anchor a class of "nospam"
Calling the jQuery nospam function on all of the "nospam" anchor tags
When a user hovers over the "nospam" link, the title is Base64 decoded
The href "#" is then replaced with the unobfuscated mailto parameters
The user clicks on the link and is able to send their email
When the mouse leaves the anchor area, then the link turns back into it's obfuscated self

string email_link ( string $text, string $to [, string $subject [, string $body ]] )

This function will create an obfuscated mailto link that is only decoded when an actual user hovers over the link with their mouse and clicks on it.

$text	The anchor text.
$to	The email address.
$subject	The email's subject.
$body	The email's body. This can include <br /> tags and newlines.
Returns	Your obfuscated email link.
Example	$html .= email_link('Spam me please', 'spam@email.ru', 'faster cheaper meds', "Hello friend,\n\nWe are please to offer...");

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email_link.php

<?php 
 
function email_link ($text, $to, $subject='', $body='') { 
  global $page; 
  $page->link('jquery.nospam.js'); 
  $page->jquery('$("a.nospam").nospam();'); 
  $link = 'mailto:' . rawurlencode($to); 
  $params = array(); 
  $remove = array('&', '=', '?', '"'); 
  if (!empty($subject)) $params[] = 'subject=' . rawurlencode(str_replace($remove, '', $subject)); 
  if (!empty($body)) { 
    $body = str_replace(array("\r\n", "\n", '<br />'), array("\n", '', '%0A'), nl2br($body)); 
    $params[] = 'body=' . rawurlencode(str_replace($remove, '', $body)); 
  } 
  if (!empty($params)) $link .= '?' . implode('&', $params); 
  $link = base64_encode($link); 
  return '<a class="nospam" href="#" title="' . $link . '">' . $text . '</a>'; 
} 
 
?>

jquery.nospam.js

function decode64 (input) { 
  var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 
  var output = ""; 
  var chr1, chr2, chr3, enc1, enc2, enc3, enc4 = ""; 
  var i = 0; 
  input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); 
  while (i < input.length) { 
    enc1 = keyStr.indexOf(input.charAt(i++)); 
    enc2 = keyStr.indexOf(input.charAt(i++)); 
    enc3 = keyStr.indexOf(input.charAt(i++)); 
    enc4 = keyStr.indexOf(input.charAt(i++)); 
    chr1 = (enc1 << 2) | (enc2 >> 4); 
    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); 
    chr3 = ((enc3 & 3) << 6) | enc4; 
    output = output + String.fromCharCode(chr1); 
    if (enc3 != 64) output = output + String.fromCharCode(chr2); 
    if (enc4 != 64) output = output + String.fromCharCode(chr3); 
    chr1 = chr2 = chr3 = enc1 = enc2 = enc3 = enc4 = ""; 
  } 
  return unescape(output); 
} 
 
(function($) { 
  $.fn.nospam = function(){ 
    return this.each(function(){ 
      var href = $(this).attr("href"); 
      var title = $(this).attr("title"); 
      $(this).hover( 
      	function(){ $(this).attr({"href":decode64(title), "title":"Click to send email"}); }, 
      	function(){ $(this).attr({"href":"#", "title":title}); } 
      ); 
    }); 
  }; 
})(jQuery);

Email Link Obfuscator

string email_link ( string $text, string $to [, string $subject [, string $body ]] )

email_link.php

jquery.nospam.js

PHP

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