PHP:生成随机字符串

default.php

/**
 * 生成随机字符串
 *
 * @access public
 * @param integer $length 字符串长度
 * @param string $specialChars 是否有特殊字符
 * @return string
 */
public static function randString($length, $specialChars = false) {
    $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    if ($specialChars) {
        $chars .= '!@#$%^&*()';
    }

    $result = '';
    $max = strlen($chars) - 1;
    for ($i = 0; $i < $length; $i++) {
        $result .= $chars[rand(0, $max)];
    }
    return $result;
}