file_upload.php

<?php

function generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

if ($_FILES['image']['size'] == 0 && $_FILES['image']['error'] == 4){
    $uri = "/uploads/0.jpg";
}else{
    $rand = generateRandomString();
    $path = $_SERVER['DOCUMENT_ROOT'] . "/uploads/" . $rand.basename($_FILES['image']['name']);
    $uri = "/uploads/" .$rand.basename($_FILES['image']['name']);
    move_uploaded_file($_FILES["image"]["tmp_name"], $path);
}