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Check if an email address is valid

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  1. /*
  2. Validate an email address.
  3. Provide email address (raw input)
  4. Returns true if the email address has the email 
  5. address format and the domain exists.
  6. */
  7. function validEmail($email)
  8. {
  9. 	$isValid = true;
  10. 	$atIndex = strrpos($email, "@");
  11. 	if (is_bool($atIndex) && !$atIndex) {
  12. 		$isValid = false;
  13. 	} else {
  14. 		$domain    = substr($email, $atIndex+1);
  15. 		$local     = substr($email, 0, $atIndex);
  16. 		$localLen  = strlen($local);
  17. 		$domainLen = strlen($domain);
  18.  
  19. 		if ($localLen < 1 || $localLen > 64) {
  20. 			// local part length exceeded
  21. 			$isValid = false;
  22. 		} else if ($domainLen < 1 || $domainLen > 255) {
  23. 			// domain part length exceeded
  24. 			$isValid = false;
  25. 		} else if ($local[0] == '.' || $local[$localLen-1] == '.') {
  26. 			// local part starts or ends with '.'
  27. 			$isValid = false;
  28. 		} else if (preg_match('/\\.\\./', $local)) {
  29. 			// local part has two consecutive dots
  30. 			$isValid = false;
  31. 		} else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain)) {
  32. 			// character not valid in domain part
  33. 			$isValid = false;
  34. 		} else if (preg_match('/\\.\\./', $domain)) {
  35. 			// domain part has two consecutive dots
  36. 			$isValid = false;
  37. 		} else if (!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/', str_replace("\\\\","",$local))) {
  38. 			// character not valid in local part unless 
  39. 			// local part is quoted
  40. 			if (!preg_match('/^"(\\\\"|[^"])+"$/', str_replace("\\\\","",$local))) {
  41. 				$isValid = false;
  42. 			}
  43. 		}
  44.  
  45. 	}
  46. 	return $isValid;
  47. }

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