PHP email validate

function check_email_address($email) {
if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) {
return false;
}

$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])) {
$domain_array = explode(".", $email_array[1]);
if (sizeof($domain_array) < 2)
{
return false;
}
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;
}

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