1 /**
 2     +----------------------------------------------------------
 3     * 生成隨機字元串
 4     +----------------------------------------------------------
 5     * @param int       $length  要生成的隨機字元串長度
 6     * @param string    $type    隨機碼類型：0，數字+大小寫字母；1，數字；2，小寫字母；3，大寫字母；4，特殊字元；-1，數字+大小寫字母+特殊字元
 7     +----------------------------------------------------------
 8     * @return string
 9     +----------------------------------------------------------
10     echo randCode(6,1);
11 */
12 function randCode($length = 32, $type = 0) {
13     $arr = array(1 => "0123456789", 2 => "abcdefghijklmnopqrstuvwxyz", 3 => "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 4 => "~@#$%^&*(){}[]|");
14     if ($type == 0) {
15         array_pop($arr);
16         $string = implode("", $arr);
17     } elseif ($type == "-1") {
18         $string = implode("", $arr);
19     } else {
20         $string = $arr[$type];
21     }
22     $count = strlen($string) - 1;
23     $code = '';
24     for ($i = 0; $i < $length; $i++) {
25         $code .= $string[rand(0, $count)];
26     }
27     return $code;
28 }