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- function validEmail($email)
- {
- $isValid = true;
- $atIndex = strrpos($email, "@");
- if (is_bool($atIndex) && !$atIndex)
- {
- $isValid = false;
- }
- else
- {
- $domain = substr($email, $atIndex+1);
- $local = substr($email, 0, $atIndex);
- $localLen = strlen($local);
- $domainLen = strlen($domain);
- if ($localLen < 1 || $localLen > 64)
- {
- // local part length exceeded
- $isValid = false;
- }
- else if ($domainLen < 1 || $domainLen > 255)
- {
- // domain part length exceeded
- $isValid = false;
- }
- else if ($local[0] == '.' || $local[$localLen-1] == '.')
- {
- // local part starts or ends with '.'
- $isValid = false;
- }
- else if (preg_match('/\\.\\./', $local))
- {
- // local part has two consecutive dots
- $isValid = false;
- }
- else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain))
- {
- // character not valid in domain part
- $isValid = false;
- }
- else if (preg_match('/\\.\\./', $domain))
- {
- // domain part has two consecutive dots
- $isValid = false;
- }
- else if
- (!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/',
- str_replace("\\\\","",$local)))
- {
- // character not valid in local part unless
- // local part is quoted
- if (!preg_match('/^"(\\\\"|[^"])+"$/',
- str_replace("\\\\","",$local)))
- {
- $isValid = false;
- }
- }
- if ($isValid && !(checkdnsrr($domain,"MX") ||
- ↪checkdnsrr($domain,"A")))
- {
- // domain not found in DNS
- $isValid = false;
- }
- }
- return $isValid;
- }
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