I have tried to create a user unique id, will it be unique or give trouble in the future?Please help. There are two functions.Need your guidance as I am a beginner
First one
private function generate_uuid() {
return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
mt_rand( 0, 0xffff ),
mt_rand( 0, 0x0fff ) | 0x4000,
mt_rand( 0, 0x3fff ) | 0x8000,
mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
);
}
Second One
private function generateCustomerID() {
return sprintf('CUID%07d', mt_rand(1, 9999999));
}