Accept - nhận đuôi file trong upload-file-input

 <input type="file" name="pic_ncc" accept=".jpeg,.jpg,.png">

OR

 <input type="file" name="pic_ncc" accept="image/*">

--> post - action - save

$image_nlh = null;

if (isset($_FILES['pic_ncc']) && $_FILES['pic_ncc']['error'] == 0) {

    $ext = strtolower(pathinfo($_FILES['pic_ncc']['name'], PATHINFO_EXTENSION));

    $allow_ext = array('jpg','png','jpeg');

    if (in_array($ext, $allow_ext)) {

        $new_name = 'picncc_'.time().'.'.$ext;

        if (move_uploaded_file($_FILES['pic_ncc']['tmp_name'], $upload_dir . $new_name)) {

            $image_nlh = $new_name;

        }

    }

}

/**************************/

<input type="file" id="images-file"  accept=".jpeg,.jpg,.png" name="images_file[]" multiple>

--> post - action - save

if (isset($_FILES['images_file']) && !empty($_FILES['images_file']['name'][0])) {

    for ($i = 0; $i < count($_FILES['images_file']['name']); $i++) {

        if ($_FILES['images_file']['error'][$i] == 0) {

            $name = $_FILES['images_file']['name'][$i];

            $tmp  = $_FILES['images_file']['tmp_name'][$i];

            $ext  = strtolower(pathinfo($name, PATHINFO_EXTENSION));

            $allow_ext = array('jpg','png');

            if (!in_array($ext, $allow_ext)) continue;

            $new_name = 'img_' . time() . '_' . $i . '.' . $ext;

            if (move_uploaded_file($tmp, $upload_banner . $new_name)) {

                $images_saved[] = $new_name;

            }

        }

    }

}

$images_db = !empty($images_saved) ? implode('**', $images_saved) : null;