可定制长度、字母、数字、大小写
-
-
- /*
- * 生成随机字符串的类，默认只包含数字、大小写字母
- * @author Jerry
- */
-
- class randomString {
- /*
- * 生成的字符串包含的字符设置
- */
-
- const NUMERIC_ONLY = 1; //只含有数字
- const LETTER_ONLY = 2; //只含有字母
- const MIXED = 3; //混合数字和字母
-
- /*
- * 用户传入变量，分别为字符串长度；包含的字母；是否包含大写字母
- */
-
- protected $length, $type, $upper;
-
- /*
- * 参数初始化
- * @param int,$length 字符串长度
- * @param const,$type 生成字符串的类型
- * @param boolean,$upper 是否含有大写字母
- */
-
- public function __construct($length = 16, $type = self::MIXED, $upper = true) {
- $this->length = $length;
- $this->type = $type;
- $this->upper = $upper;
- }
-
- /*
- * 对象被转化为字符串时调用
- * @return string
- */
-
- public function __toString() {
- return $this->pickUpChars();
- }
-
- /*
- * 生成随机字符串
- * @global $type
- * @return string,$string
- */
-
- public function pickUpChars() {
- switch ($this->type) {
- case self::NUMERIC_ONLY:
- $raw = '0123456789';
- break;
- case self::LETTER_ONLY:
- $raw = 'qwertyuioplkjhgfdsazxcvbnm' .
- 'QWERTYUIOPLKJHGFDSAZXCVBNM';
- break;
-
- default:
- $raw = 'qwertyuioplkjhgfdsazxcvbnm' .
- 'QWERTYUIOPLKJHGFDSAZXCVBNM' .
- '0123456789';
- break;
- }
- $string = '';
- for ($index = 0; $index length; $index++)
- $string .= substr($raw, mt_rand(0, strlen($raw) - 1), 1);
- if (!$this->upper)
- $string = strtolower($string);
- return $string;
- }
-
- }
-
- //echo new randomString(170, randomString::MIXED, TRUE).'
';
-
-
|
659
收藏
