How to get random numbers in PHP

This article mainly introduces the common methods of simply obtaining random numbers in PHP, and analyzes the simple implementation techniques of PHP to implement random numbers in a specified range and random numbers in a specified character sequence in the form of examples. Friends in need can refer to the following

1. Directly obtain the number from min-max, such as 1-20:

$randnum = mt_rand(1, 20);

2. Randomly select one in an array ( The verification code requires a mixture of letters and numbers)

function randUid(){
 $str = "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20";//要显示的字符，可自己进行增删
 $list = explode(",", $str);
 $cmax = count($list) - 1;
 $randnum = mt_rand(0, $cmax);
 $uid = $list[$randnum];
}

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