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ultimate validate email function

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  1. <?php
  2.  
  3. function validateEmail($email)
  4. {
  5.    $isValid = true;
  6.    $atIndex = strrpos($email, "@");
  7.    if (is_bool($atIndex) && !$atIndex)
  8.    {
  9.       $isValid = false;
  10.    }
  11.    else
  12.    {
  13.       $domain = substr($email, $atIndex+1);
  14.       $local = substr($email, 0, $atIndex);
  15.       $localLen = strlen($local);
  16.       $domainLen = strlen($domain);
  17.       if ($localLen < 1 || $localLen > 64)
  18.       {
  19.          // local part length exceeded
  20.          $isValid = false;
  21.       }
  22.       else if ($domainLen < 1 || $domainLen > 255)
  23.       {
  24.          // domain part length exceeded
  25.          $isValid = false;
  26.       }
  27.       else if ($local[0] == '.' || $local[$localLen-1] == '.')
  28.       {
  29.          // local part starts or ends with '.'
  30.          $isValid = false;
  31.       }
  32.       else if (preg_match('/\\.\\./', $local))
  33.       {
  34.          // local part has two consecutive dots
  35.          $isValid = false;
  36.       }
  37.       else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain))
  38.       {
  39.          // character not valid in domain part
  40.          $isValid = false;
  41.       }
  42.       else if (preg_match('/\\.\\./', $domain))
  43.       {
  44.          // domain part has two consecutive dots
  45.          $isValid = false;
  46.       }
  47.       else if
  48. (!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/',
  49.                  str_replace("\\\\","",$local)))
  50.       {
  51.          // character not valid in local part unless 
  52.          // local part is quoted
  53.          if (!preg_match('/^"(\\\\"|[^"])+"$/',
  54.              str_replace("\\\\","",$local)))
  55.          {
  56.             $isValid = false;
  57.          }
  58.       }
  59.       if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A")))
  60.       {
  61.          // domain not found in DNS
  62.          $isValid = false;
  63.       }
  64.    }
  65.    return $isValid;
  66. }
  67.  
  68. ?>

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