nb_youtube.php

<?php
include "./config/database.php";

$nbYT 			= (isset($_POST['nbYT']))?$_POST['nbYT']:null;
$userYT 			= (isset($_POST['userYT']))?$_POST['userYT']:null;


$sql="UPDATE influenceurs set nb_youtube='$nbYT' where tag_youtube='$userYT'";

if(mysqli_query($link, $sql)===TRUE){
    echo "DATA updated";
}

?>