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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
$isValid = false;
} else if (!strrpos($domain, ".")) {
// domain part does not have .
$isValid = false;
} else if ($domain[0] == '.' || $domain[$domainLen - 1] == '.') {
// domain part starts or ends with '.'
$isValid = false;
} else if ($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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