diff --git a/db.php b/db.php
index 5504577..3666d39 100644
--- a/db.php
+++ b/db.php
@@ -1,7 +1,8 @@
 <?php
 
-$mysqli = mysqli_connect('localhost', 'root', '','mydb1'); 
-if(!isset($mysqli)){
-	echo "error";
-}
-?>
\ No newline at end of file
+$USER_DB="root";
+$HOST="localhost";
+$PASSWORD='';
+try{
+	$mysqli = new PDO('mysql:localhost;dbname=mydb1',$USER_DB, $PASSWORD);
+} 
\ No newline at end of file
diff --git a/delete.php b/delete.php
index c9ccd65..6f73127 100644
--- a/delete.php
+++ b/delete.php
@@ -4,7 +4,9 @@
 }
 $id = $_GET['id'];
 include("db.php");
-$result = mysqli_query($mysqli, "DELETE FROM etudiant WHERE id=$id");
+$result = $mysqli->prepare("DELETE FROM etudiant WHERE id={$id}");
+$result->execute([":id",$id]);
 
 header("Location:index.php");
+
 ?>
diff --git a/index.php b/index.php
index 0224801..d78dc6e 100644
--- a/index.php
+++ b/index.php
@@ -6,7 +6,7 @@
 if (isset($_REQUEST['search'])) {
 	$serch = $_GET['search'];
 }
-$result = mysqli_query($mysqli, "SELECT * FROM `etudiant` WHERE `email` LIKE '%$serch%'");
+$result =$mysqli->query("SELECT * FROM `etudiant` WHERE `email` LIKE '%$serch%'");
 require "header.php";
 ?>
 <div class="container">