在PHP中生成唯一字母表时出现问题

Question

Am trying to generate a unique value in PHP where the first and last letters should be J and 1 respectively while the middle characters should be a series of aplhabetical letters and the whole value should be 7 in total eg JWERYH1 Please assist?

$let = chr(rand(65, 90));

$all = 'J' . $let . '1';

dd($all);

Answer 1

Try this code

$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$res = "";
for ($i = 0; $i < 5; $i++) {
    $res .= $chars[mt_rand(0, strlen($chars)-1)];
}

echo 'J'.$res.'1';