A method of obtaining random numbers by PHP implementation

This article mainly introduces PHP simple acquisition of random numbers of common methods, combined with examples of PHP implementation of the specified range of random number and the specified character sequence random number of simple implementation skills, the need for friends can refer to the following

1. Get directly from the number of Min-max, for example 1-20:

$randnum = Mt_rand (1, 20);

2. Randomly select one in an array (the case of a combination of letters and numbers is required when verifying the code)

function Randuid () {$str = "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20";//The characters to be displayed can be deleted by themselves $list = Explode (",", $STR); $cmax = count ($list)-1; $randnum = Mt_rand (0, $cmax); $uid = $list [$randnum];}

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