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<?php
   // Database Connection
   include 'connexion.php';

// Reading value
   $draw = $_POST['draw'];
   $row = $_POST['start'];
   $rowperpage = $_POST['length']; // Rows display per page
   $columnIndex = $_POST['order'][0]['column']; // Column index
   $columnName = $_POST['columns'][$columnIndex]['data']; // Column name
   $columnSortOrder = $_POST['order'][0]['dir']; // asc or desc
   $searchValue = $_POST['search']['value']; // Search value

$searchArray = array();

// Search
   $searchQuery = " ";
   if($searchValue != ''){
      $searchQuery = " AND (email LIKE :email OR 
           first_name LIKE :first_name OR
           last_name LIKE :last_name OR 
           address LIKE :address ) ";
      $searchArray = array( 
           'email'=>"%$searchValue%",
           'first_name'=>"%$searchValue%",
           'last_name'=>"%$searchValue%",
           'address'=>"%$searchValue%"
      );
   }

// Total number of records without filtering
   $stmt = $conn->prepare("SELECT COUNT(*) AS allcount FROM employees ");
   $stmt->execute();
   $records = $stmt->fetch();
   $totalRecords = $records['allcount'];
   
   echo $totalRecords;

// Total number of records with filtering
   $stmt = $conn->prepare("SELECT COUNT(*) AS allcount FROM employees WHERE 1 ".$searchQuery);
   $stmt->execute($searchArray);
   $records = $stmt->fetch();
   $totalRecordwithFilter = $records['allcount'];

// Fetch records
   $stmt = $conn->prepare("SELECT * FROM employees WHERE 1 ".$searchQuery." ORDER BY ".$columnName." ".$columnSortOrder." LIMIT :limit,:offset");

// Bind values
   foreach ($searchArray as $key=>$search) {
      $stmt->bindValue(':'.$key, $search,PDO::PARAM_STR);
   }

$stmt->bindValue(':limit', (int)$row, PDO::PARAM_INT);
   $stmt->bindValue(':offset', (int)$rowperpage, PDO::PARAM_INT);
   $stmt->execute();
   $empRecords = $stmt->fetchAll();

$data = array();

foreach ($empRecords as $row) {
      $data[] = array(
         "email"=>$row['email'],
         "first_name"=>$row['first_name'],
         "last_name"=>$row['last_name'],
         "address"=>$row['address']
      );
   }

// Response
   $response = array(
      "draw" => intval($draw),
      "iTotalRecords" => $totalRecords,
      "iTotalDisplayRecords" => $totalRecordwithFilter,
      "aaData" => $data
   );

print_r($response);

echo json_encode($response);