Upload obrázků, nenahrají se všechny

<?php
 require("settings.php");
 $adresar = $_POST["adresar"];
if(isset($_FILES['files'])){
    $errors= array();
    foreach($_FILES['files']['tmp_name'] as $key => $tmp_name ){
        $file_name = $_FILES['files']['name'][$key];
        $file_size =$_FILES['files']['size'][$key];
        $file_tmp =$_FILES['files']['tmp_name'][$key];
        $file_type=$_FILES['files']['type'][$key];    
        if($file_size > 2097152){
            $errors[]='File size must be less than 2 MB';
        }        
        $query="INSERT into upload_data (`USER_ID`,`FILE_NAME`,`FILE_SIZE`,`FILE_TYPE`) VALUES('$user_id','$file_name','$file_size','$file_type'); ";
        $desired_dir="$adresar";
        if(empty($errors)==true){
            if(is_dir($desired_dir)==false){
                mkdir("$desired_dir", 0700);        // Create directory if it does not exist
            }
            if(is_dir("$desired_dir/".$file_name)==false){
                move_uploaded_file($file_tmp,"$desired_dir/".$file_name);
            }else{                                    // rename the file if another one exist
                $new_dir="$desired_dir/".$file_name.time();
                 rename($file_tmp,$new_dir) ;                
            }
         mysql_query($query);            
        }else{
                print_r($errors);
        }
    }
    if(empty($error)){
        echo "Success";
    }
}
?>


<form action="" method="POST" enctype="multipart/form-data">
Zde zadej název adresáře, podle Contentgroup, pro tlačítko napiš img: <input name="adresar" value=""/><br>
    <input type="file" name="files[]" multiple/>
    <input type="submit"/>
</form>