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How to insert more than 1 row into foreign key table in php mysql?

Maybe you can try insert through for loop, like this:

$notice = "SELECT id FROM notification WHERE noti_user ='Pro'";

$noticeqry = mysqli_query($con, $notice); 

$row = $noticeqry->fetch_assoc();

$count_id = mysqli_num_rows($noticeqry);

for($i=0; $i < $count_id; $i++){

    $noticerow = $row['id'][$i];

    $sql = "INSERT INTO `user_notification` (`notif_id`, `user_id`) values ('$noticerow', '$univuid')";

    $query= mysqli_query($con,$sql);

}

if($query) {

    echo "New record created successfully";

} else { 

    echo "Error: " .