how to add multiple images in php

1if (isset($_POST['submit'])) {
2    $j = 0; //Variable for indexing uploaded image 
3
4    $target_path = "uploads/"; //Declaring Path for uploaded images
5    for ($i = 0; $i < count($_FILES['file']['name']); $i++) { //loop to get individual element from the array
6
7        $validextensions = array("jpeg", "jpg", "png"); //Extensions which are allowed
8        $ext = explode('.', basename($_FILES['file']['name'][$i])); //explode file name from dot(.) 
9        $file_extension = end($ext); //store extensions in the variable
10
11        $target_path = $target_path.md5(uniqid()).
12        ".".$ext[count($ext) - 1]; //set the target path with a new name of image
13        $j = $j + 1; //increment the number of uploaded images according to the files in array       
14
15        if (($_FILES["file"]["size"][$i] < 100000) //Approx. 100kb files can be uploaded.
16            && in_array($file_extension, $validextensions)) {
17            if (move_uploaded_file($_FILES['file']['tmp_name'][$i], $target_path)) { //if file moved to uploads folder
18                echo $j.
19                ').<span id="noerror">Image uploaded successfully!.</span><br/><br/>';
20            } else { //if file was not moved.
21                echo $j.
22                ').<span id="error">please try again!.</span><br/><br/>';
23            }
24        } else { //if file size and file type was incorrect.
25            echo $j.
26            ').<span id="error">***Invalid file Size or Type***</span><br/><br/>';
27        }
28    }
29}
30