EMAIL VALIDATION IN PHP

<br />include "emailvalidation.php"; <br /> <br />if (check_email_address($userid)) { <br />$inn="select * from `egcc_member` where `email_address`='$userid'"; <br />$outt=mysql_query($inn); <br />$record=mysql_fetch_array($outt); <br />} else { <br />$in="select * from `nam_direct_members` where `cart_session_id`='$userid'"; <br />$out=mysql_query($in); <br />$record=mysql_fetch_array($out); <br />} <br /> <br /> <br /> <br /> <br />//function <br /> <br /> <br /><? <br /> <br />function check_email_address($email) { <br />// First, we check that there's one @ symbol, and that the lengths are right <br />if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) { <br />// Email invalid because wrong number of characters in one section, or wrong number of @ symbols. <br />return false; <br />} <br />// Split it into sections to make life easier <br />$email_array = explode("@", $email); <br />$local_array = explode(".", $email_array[0]); <br />for ($i = 0; $i < sizeof($local_array); $i++) { <br />if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) { <br />return false; <br />} <br />} <br />if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name <br />$domain_array = explode(".", $email_array[1]); <br />if (sizeof($domain_array) < 2) { <br />return false; // Not enough parts to domain <br />} <br />for ($i = 0; $i < sizeof($domain_array); $i++) { <br />if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) { <br />return false; <br />} <br />} <br />} <br />return true; <br />} <br />?> <br /> <br />