Common ways 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

The example in this article describes the common method of simply obtaining random numbers in PHP. Share it with everyone for your reference, the details are as follows:

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

$randnum = mt_rand(1, 20);

2. Randomly select one from an array (when 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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