PHP generates five-digit invitation code

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Model

/**     * Generate invitation code     * @param $uid     * @return string     */public function Initcode () {        $code = ' ABCDEFGHIJKLMNOPQRSTUVWXYZ ';        $rand = $code [rand (0,25)]            . Strtoupper (Dechex (date (' M '))).            Date (' d '). substr (Time (), -5)            . substr ( Microtime (), 2,5)            . sprintf ('%02d ', rand (0,99));        for (            $a = MD5 ($rand, true),            $s = ' 0123456789ABCDEFGHIJKLMNOPQRSTUV ',            $d = ',            $f = 0;            $f < 5;            $g = Ord ($a [$f]),            $d. = $s [($g ^ ord ($a [$f + 8]))-$g & 0x1F],            $f + +        );        return $d;    }    /**     * Whether to repeat */public    function Recode ($code) {        if ($this->where (' code= '. $code)->find ()) {            return false;        }        return true;    }

Action

/** * My invitation code * @author Zhangfeng */Public Function Mycode () {$model = M (' Usercode ')        );        $uid = ($_get[' uid ');        $code = $model->is_code ($uid);        $this->assign (' Code ', $code);            if (! $code) {$code = $this->getcode ($model, $uid);            $res = $model->savecode ($uid, $code);            if ($res) {$this->assign (' Code ', $code); } else {$this->assign (' Code '), ' Invitation code generation failed!            , error: '. $model->geterror ());    }} $this->display ();    }/** * Recursive function gets an absolutely non-repeating invitation code * @author Zhangfeng * @param $model * @param $uid * @return Mixed * *        Private Function GetCode ($model, $uid) {$code = $model->initcode ($uid);        if ($model->recode ($code)) {return $code;            } else {while (true) {$this->getcode ($model, $uid); }        }    }