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Use PHP to detect if given string is a proper email address

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  1. function is_proper_email($email) {
  2.   // First, we check that there's one @ symbol, and that the lengths are right
  3.   if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) {
  4.     // Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
  5.     return false;
  6.   }
  7.   // Split it into sections to make life easier
  8.   $email_array = explode("@", $email);
  9.   $local_array = explode(".", $email_array[0]);
  10.   for ($i = 0; $i < sizeof($local_array); $i++) {
  11.      if (!ereg("^(([A-Za-z0-9!#$%&#038;'*+/=?^_`{|}~-][A-Za-z0-9!#$%&#038;'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) {
  12.       return false;
  13.     }
  14.   }  
  15.   if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
  16.     $domain_array = explode(".", $email_array[1]);
  17.     if (sizeof($domain_array) < 2) {
  18.         return false; // Not enough parts to domain
  19.     }
  20.     for ($i = 0; $i < sizeof($domain_array); $i++) {
  21.       if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
  22.         return false;
  23.       }
  24.     }
  25.   }
  26.   return true;
  27. }
  28.  
  29. //usage
  30. // $email_result = is_proper_email($email_string);
  31. // $email_result will be either true or false

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