PHP Case List Sharing

<?php function Getfourstr ($len) { $chars _array = Array ( "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "s", "T", "U", "V", "W", "X", "Y", "Z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", ); $charsLen = count ($chars _array)-1; $outputstr = ""; for ($i =0; $i < $len; $i + +) { $outputstr. = $chars _array[mt_rand (0, $charsLen)]; } return $outputstr; } Echo Getfourstr (4); ?>

part of the function parsing:mt_rand function Description: Mt_rand () returns a random integer.

if no optional parameter min and Max,mt_rand () are provided, the pseudo-random number between 0 and Rand_max is returned.

For example, want a random number between 0 and 46 (including 0 and 46), with Mt_rand (0, 46).

PHP Case List Sharing