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E-Mail Address Validation

/ Published in: PHP
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  1. function validEmail($email) {
  2. 	$isValid = true;
  3. 	$atIndex = strrpos($email, "@");
  4. 	if (is_bool($atIndex) && !$atIndex) {
  5. 		$isValid = false;
  6. 	} else {
  7. 		$domain = substr($email, $atIndex+1);
  8. 		$local = substr($email, 0, $atIndex);
  9. 		$localLen = strlen($local);
  10. 		$domainLen = strlen($domain);
  11. 		if ($localLen < 1 || $localLen > 64) {
  12. 			$isValid = false;
  13. 		} else if ($domainLen < 1 || $domainLen > 255) {
  14. 			$isValid = false;
  15. 		} else if ($local[0] == '.' || $local[$localLen-1] == '.') {
  16. 			$isValid = false;
  17. 		} else if (preg_match('/\\.\\./', $local)) {
  18. 			$isValid = false;
  19. 		} else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain)) {
  20. 			$isValid = false;
  21. 		} else if (preg_match('/\\.\\./', $domain)) {
  22. 			$isValid = false;
  23. 		} else if (!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/',str_replace("\\\\","",$local))) {
  24. 			if (!preg_match('/^"(\\\\"|[^"])+"$/',str_replace("\\\\","",$local))) {
  25. 				$isValid = false;
  26. 			}
  27. 		}
  28.   		if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A"))) {
  29. 			$isValid = false;
  30. 		}
  31. 	}
  32. 	return $isValid;
  33. }

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