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PHP Generate new pin

New PIN   generate

function generatePIN($digits = 4){
    $i = 0; //counter 
    while($i < $digits){
        //generate a random number between 0 and 9.
        $pin .= mt_rand(0, 9);
        $i++;
    }
    return $pin;
}

//If I want a 4-digit PIN code.
$pin = generatePIN(); 
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