/**
 * 生成礼包接口 100W数据同时生成不重复
 * @return string
 */
function sp_gm_get_gift_code($number) {
    for ($i=0;$i<$number;$i++){
        $uniqid = uniqid('gm',true);
        $param_string = $_SERVER['HTTP_USER_AGENT'].$_SERVER['REMOTE_ADDR'].$_SERVER['SERVER_SOFTWARE'].time().rand().$uniqid;
        $sha1 = sha1($param_string);
        for(
            $a=$sha1,
            $s = '0123456789abcdefghijklmnopqrstuvwxyz',
            $d = '',
            $f = 0;
            $f < 12;
            $g = ord( $a[ $f ] ),
            $d .= $s[ ( $g ^ ord( $a[ $f + 8 ] ) ) - $g & 0x1F ],
            $f++
        );
        yield $d;
    }
}

　　　　　　　$result=sp_gm_get_gift_code($code_num);
            foreach($result as $key => $value){
               echo $value;
            }