Update upload.php

examples/php-xhr/upload.php

@@ -3,33 +3,35 @@ ini_set('display_errors', 1);
 ini_set('display_startup_errors', 1);
 error_reporting(E_ALL);
 
-if($_SERVER["REQUEST_METHOD"] == "OPTIONS")
-{
-    if (isset($_SERVER["HTTP_ACCESS_CONTROL_REQUEST_METHOD"]))
-        header("Access-Control-Allow-Methods: POST, GET, OPTIONS, DELETE, PUT"); //Make sure you remove those you do not want to support
-        header("Access-Control-Allow-Origin: *");
+if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
+    if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD'])) {
+        header('Access-Control-Allow-Methods: POST, GET, OPTIONS, DELETE, PUT');
+    }
+    //Make sure you remove those you do not want to support
+    header('Access-Control-Allow-Origin: *');
 
-    if (isset($_SERVER["HTTP_ACCESS_CONTROL_REQUEST_HEADERS"]))
-        header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
+    if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS'])) {
+        header('Access-Control-Allow-Headers: {$_SERVER["HTTP_ACCESS_CONTROL_REQUEST_HEADERS"]}');
+    }
 
     //Just exit with 200 OK with the above headers for OPTIONS method
     exit(0);
 }
 
-if($_POST) {
-      $target_dir = "./uploads/";
-      $target_file = $target_dir . basename($_FILES["files"]["name"][0]);
-      if (move_uploaded_file($_FILES["files"]["tmp_name"][0], $target_file)) {
-        header("Access-Control-Allow-Origin: *");
+if ($_POST && !empty($_FILES["files"])) {
+    $target_dir = './uploads/';
+    $target_file = $target_dir . basename($_FILES['files']['name'][0]);
+    if (move_uploaded_file($_FILES['files']['tmp_name'][0], $target_file)) {
+        header('Access-Control-Allow-Origin: *');
         header('Content-type: application/json');
-        $data = ["url" => $target_file, "message" => "The file ". basename( $_FILES["files"]["name"][0]). " has been uploaded."];
+        $data = ['url' => $target_file, 'message' => 'The file ' . basename($_FILES['files']['name'][0]) . ' has been uploaded.'];
         http_response_code(201);
-        echo json_encode( $data );
-      } else {
-        header("Access-Control-Allow-Origin: *");
+        echo json_encode($data);
+    } else {
+        header('Access-Control-Allow-Origin: *');
         header('Content-type: application/json');
-        $data = ["message" => "Sorry, there was an error uploading your file."];
+        $data = ['message' => 'Sorry, there was an error uploading your file.'];
         http_response_code(400);
-        echo json_encode( $data );
-      }  
-}?>
+        echo json_encode($data);
+    }
+}