检查数组是否在DB中有ID更新，否则执行insert

Question

I send input values with same names in array(ID inside) by post as it shown bellow

<form action="" method="POST" role="form" name="formetn" enctype="multipart/form-data">
  <input type="text" name="videolinks[<?php echo $videoid; ?>]" value="<?php echo $videolink; ?>" class="form-control">
</form

Here I am getting array and parse it

if(isset($_POST["hidden_input_name"]) && $_POST["hidden_input_name"]!="") 
{
  $ppp = $_POST['videolinks'];

  $arraylength = count($ppp);     //here i got count of sent items

  $ids = implode(",",array_keys($ppp));         //here I parse keys
  $escaped_values = array_map('mysql_real_escape_string', array_values($ppp));
  $values  = implode(",", $escaped_values);      //here I parse values
}

Now I need to check if i have same ID in my table--> do update of this row
If it is new ID --> do Insert this row

for($i = 0; $i < $arraylength; $i++)
{
  while($row = mysqli_fetch_array($selectvidelink))
  {
    $videoid  = $row["ID"];
  if ($videoid == key($ppp)) 
  {
   //do update of this row
  }
  else
  {
   //do insert of this row
  }
 }
}

I know that I do wrong smth, but do not know what exactly I should change to check array.

Answer 1

<?php

if(isset($_POST["videolinksecret"]) && $_POST["videolinksecret"]!="" && ($_POST["videolinksecret"]) === "baisdbsdvSuvhs7634bHv73bnjonasecret")
{
$conn = connect_to_bd();
mysqli_set_charset($conn,"utf8");

//var_dump($_POST['videolinks']);

$fullarray = $_POST['videolinks'];

    foreach($fullarray as $key => $value) 
    {
        $query = "select * from videolink where id=$key";
        $pp = mysqli_query($conn,$query);
        if(mysqli_num_rows($pp)){
                $dd = "update videolink set `videolink`='$value' where id=$key";
        }
        else{
                $dd = "insert into videolink(`videolink`) values('$value')";
        }
        $videolinkupdate = mysqli_query($conn,$dd);
        //echo "$key is at $value";
    }
    if($videolinkupdate)
    {
        echo $alertx='<div class="alert alert-success alert-dismissible" id = "successupdate" role="alert">
                <button type="button" class="close" data-dismiss="alert" aria-label="Kapat"><span aria-hidden="true">&times;</span></button>
                <strong>Success!</strong>
            </div>';
    }
        else
    {
        echo $alertx='<div class="alert alert-danger alert-dismissible" id = "successupdate" role="alert">
                    <button type="button" class="close" data-dismiss="alert" aria-label="Kapat"><span aria-hidden="true">&times;</span></button>
                    <strong>ERROR!</strong> ERROR 03! 
                </div>';
    }
    
}

<form action="" method="POST" role="form" name="formetn" enctype="multipart/form-data">
  <div class="col-sm-9">
    <input type="text" name="videolinks[<?php echo $videoid; ?>]" value="<?php echo $videolink; ?>" class="form-control">
  </div>
  <button type="submit" id="btnformetn" class="btn btn-md btn-success pull-right">Update</button>
</form>

</div>