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/**
  +----------------------------------------------------------
 * 生成隨機(jī)字符串
  +----------------------------------------------------------
 * @param int       $length  要生成的隨機(jī)字符串長(zhǎng)度
 * @param string    $type    隨機(jī)碼類型：0，數(shù)字+大小寫(xiě)字母；1，數(shù)字；2，小寫(xiě)字母；3，大寫(xiě)字母；4，特殊字符；-1，數(shù)字+大小寫(xiě)字母+特殊字符
  +----------------------------------------------------------
 * @return string
  +----------------------------------------------------------
 */
function randCode($length = 5, $type = 0) {
    $arr = array(1 => "0123456789", 2 => "abcdefghijklmnopqrstuvwxyz", 3 => "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 4 => "~@#$%^&*(){}[]|");
    if ($type == 0) {
        array_pop($arr);
        $string = implode("", $arr);
    } elseif ($type == "-1") {
        $string = implode("", $arr);
    } else {
        $string = $arr[$type];
    }
    $count = strlen($string) - 1;
    $code = '';
    for ($i = 0; $i < $length; $i++) {
        $code .= $string[rand(0, $count)];
    }
    return $code;
}
//echo randCode(6,1);