update.php

<?php
header("Content-type:application/json");
require_once "../connection.php";
$relay_1 = saring($_POST['relay_1']);
$relay_2 = saring($_POST['relay_2']);
$digital3v1 = saring($_POST['digital_3v1']);
$digital3v2 = saring($_POST['digital_3v2']);
$digital5v1 = saring($_POST['digital_5v1']);
$digital5v2 = saring($_POST['digital_5v2']);
$digital12v1 = saring($_POST['digital_12v1']);
$digital12v2 = saring($_POST['digital_12v2']);
$digital24v1 = saring($_POST['digital_3v1']);
$digital24v2 = saring($_POST['digital_24v2']);
try{
    $sql = "UPDATE output_v2 SET relay_1='$relay_1', relay_2 ='$relay_2', digital_3v1 = '$digital3v1, digital_3v1 = '$digital3v2, digital_5v1 = '$digital5v1, digital_5v2 = '$digital5v2, digital_12v1 = '$digital12v1, digital_12v2 = '$digital12v2, digital_24v1 = '$digital24v1, digital_24v2 = '$digital24v2";
    $stmt  = $connection->prepare($sql);
    $stmt->execute();

}catch (PDOException $e){
    die("Error : "  . $e->getMessage());
}

?>