<?php 

include('includes/config/config.php');
include('log_entry.php');

$location = $_REQUEST['location'];
$cylinder_number = $_REQUEST['cylinder_number'];
$type = $_REQUEST['type'];

$sql = "SELECT * FROM oxygen_cylinder where `loc` = '$location' and `oxygen_kit_no` = '$cylinder_number' and `type` = '$type'";
error_log($sql);
$exicute = mysqli_query($conn, $sql);
$fetch = mysqli_fetch_assoc($exicute);

if (mysqli_num_rows($exicute) > 0) {
    echo $fetch['id'];
}else{
    echo 0;
}
?>