Retrieve multiple values from table column with comma separated values using explode in PHP [closed]

I insert data successfully, multiple value using implode() function, but I am not fetched the multiple data from table please help me

Data Value in table column like 28,29,30,31,62

am get only one first id

$services_sql1="select * from footer_servicess where id ='".$pro_bfloors[coures]."'";
$services_query1 = mysqli_query($conn,$services_sql1);
while($coures_subject=mysqli_fetch_array($services_query1)){
    print_r(explode(',',$coures_subject[cont_title],1));
    $coursid = explode(" ",$coures_subject[cont_title]);
    foreach ($coursid as $studentid){
        print_r($studentid);
    }
}