也发一个生成随机字符串函数

1. /**
2. * 生成随机数
3. *
4. * @param int $length 生成字符串长度
5. * @param int $type 字符串类型
6. * @param bool $special 是否使用特殊字符
7. * @return string 返回生成的随机字符串
8. * @example random(10, null, true);
9. */
10. function random($length, $type = NULL, $special = FALSE) {
11. $str = "";
12. switch ($type) {
13. case 1:
14. $str = "0123456789";
15. break;
16. case 2:
17. $str = "abcdefghijklmnopqrstuvwxyz";
18. break;
19. case 3:
20. $str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
21. break;
22. case 4:
23. $str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
24. break;
25. default:
26. $str = "abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789";
27. break;
28. }
29. return substr(str_shuffle(($special != FALSE) ? '!@#$%^&*()_+' . $str : $str), 0, $length);
30. }

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