PHP verifies the validity and correctness of user-entered mailboxes

function Validate_email ($email) {

$exp = "^[a-z ' 0-9]+ ([. _-][a-z ' 0-9]+) *@ ([a-z0-9]+ ([. _-][a-z0-9]+)) +$";

if (eregi ($exp, $email)) {//Validate the validity of the email format with a regular expression first

if (Array_pop (Explode ("@", $email), "MX")) {//CHECKDNSRR Verify the validity of the domain name portion of the email CHECKDNSRR

return true;

}else{

return false;

}

}else{

return false;

}

}

Note: The CHECKDNSRR function is not valid on the win host! The following is a foreign programmer proposed a solution, and another write a function instead of the CHECKDNSRR function:

function MYCHECKDNSRR ($hostName, $recType = ' ") {

if (!emptyempty ($hostName)) {

if ($recType = = ") $recType =" MX ";

EXEC ("nslookup-type= $recType $hostName", $result);

foreach ($result as $line) {

if (eregi ("^ $hostName", $line)) {

return true;

}

}

return false;

}

return false;

}