代码中的问题，不能在PHP中重复相同的数字

Hello guys

我写了这个函数，返回数据库中同一天不能存在的时间（数字），这意味着同一时间不能重复但是当我执行它的时间（数字）重复

你可以帮我解决这个吗？



注意：表是空的它将在整个代码执行时填写我刚刚发布的功能，不得重复该时间。

Hello guys
I've wrote this function that returns a time(number )that must not exist in the same day in the database which means that the same time must not be repeated but when i execute it the time(number) is repeated
can you help me sort this one out?

note: the table is empty and it will be filled when the entire code is executed i have just posted the function that must not repeat the time.

function checkTime($className,$day,$conn){
      
    global $numberLimet,$Daily,$UserLimt,$exist;

    $sqlHoure = "SELECT * from schedule WHERE classname='".$className."'";
    $hourQuery = mysqli_query($conn,$sqlHoure);
    $h = array();
    

    while ($hour = mysqli_fetch_assoc($hourQuery)){
 
        
        $h[$hour['hour']] = $hour['day1'];

       // array_search();
    }

    $number = rand(1,7);

    if(array_search($day,$h) && array_key_exists($number,$h)){


        return 'error';


    }else{

        
     if($hour['hour'] != $number && $hour['day1']  != $day){

        $numberLimet++;
        if($numberLimet == $Daily){
            $UserLimt = 1;
            $FristAdd = false;

            echo("UserLimt" . $UserLimt);

            return 'errorLimit';
        }else{
            return $number;

        }

     }else{
     }
      
     // 
        

    }

    return $h;


          
}

我的尝试：



i尝试多次更改代码，但结果相同

What I have tried:

i tried to change the code many times but the same result