php隨機數代碼：php產生隨機數與隨機字串的例子

/** * @param string $type * @param $length * @return string */ function randomString($type="number,upper,lower",$length){ $valid_type = array('number','upper','lower'); $case = explode(",",$type); $count = count($case); //根據交集判斷參數是否合法 if($count !== count(array_intersect($case,$valid_type))){ return false; } $lower = "abcdefghijklmnopqrstuvwxyz"; $upper = strtoupper($lower); $number = "0123456789"; $str_list = ""; for($i=0;$i<$count;++$i){ $str_list .= $$case[$i]; } return substr(str_shuffle($str_list),0,$length); } echo randomString("number,upper,lower",12); 複製代碼

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