About laravel affairs

<code>        DB::beginTransaction();
        foreach($checkArr[0] as $v){
            $id = explode('-',$v)[0];
            $rank = explode('-',$v)[1] != '' ? explode('-',$v)[1] : 5;
            if(index_friendlink::where('id','=',$id)->pluck('online') == 1){
                $updrank = index_friendlink::find($id);
                $updrank -> rank = $rank;
                $updrank -> save();
            }
        }
        $ret = index_friendlink::where('online','=','1')->get();
        foreach($ret as $v) {
            $retRank[] = $v->rank;
        }
        if (count($retRank) != count(array_unique($retRank))) {
            DB::rollback();
            echo '2';
            exit;
        }
        DB::commit();
        
        
        怎么回滚不了，第一次使用laravel，求大神解答，数据库已改成innodb</code>

Reply content:

<code>        DB::beginTransaction();
        foreach($checkArr[0] as $v){
            $id = explode('-',$v)[0];
            $rank = explode('-',$v)[1] != '' ? explode('-',$v)[1] : 5;
            if(index_friendlink::where('id','=',$id)->pluck('online') == 1){
                $updrank = index_friendlink::find($id);
                $updrank -> rank = $rank;
                $updrank -> save();
            }
        }
        $ret = index_friendlink::where('online','=','1')->get();
        foreach($ret as $v) {
            $retRank[] = $v->rank;
        }
        if (count($retRank) != count(array_unique($retRank))) {
            DB::rollback();
            echo '2';
            exit;
        }
        DB::commit();
        
        
        怎么回滚不了，第一次使用laravel，求大神解答，数据库已改成innodb</code>

Your rollback conditions are determined using PHP, and the transaction should be separated from PHP and can be implemented directly in MySQL. For example, if deletion or insertion fails or rollback does not reach commit. Check out this question