PHP随机生成字符串

1、PHP随机生成字符串，适用于自动生成密码。创建一个PHP文件写入如下内容<?phpfunction code($num =16){$char =Array('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','0','1','2','3','4','5','6','7','8','9');$i= 0;while($i < $num){$rand = mt_rand(0,61); $key .= $char["$rand"];$i++;}return $key;}//使用方法//$a = code(3); 3为随机码个数，可改为任意数字，不填则默认16位