<?php

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