<?php include('includes/functions.php'); include('includes/config/config.php'); error_log("date " . $_POST['date']); // $date = date("Y-m-d", strtotime($_POST['date'])); $date = DateTime::createFromFormat("d/m/Y", $date)->format("Y-m-d"); error_log("date " . $date); $attendance_id = -1; if (!empty($date)) { $check = "select * from attendance_master where attendance_date = '" . $date . "'"; error_log("query " . $check); $result = mysqli_query($conn, $check); if (mysqli_num_rows($result) > 0) { $row = mysqli_fetch_assoc($result); $attendance_id = $row['attendance_id']; } } echo json_encode($attendance_id);