Get uploaded file name doesn't work / PHP -

i have following php/ html code:

   <?php             if($_server['request_method'] == 'post')         {            $file_name = "../images/".$_files["file"]["name"];}            echo $file_name;     ?>     <form name="updatearticle" method="post">    <div class="custom_file_upload">           <input type="text" class="file" name="file_info" id="file_info" disabled="disabled" value="<?php echo $image_name;?>">           <div class="file_upload">                 <input type="file" id="file_upload" name="file" onchange="name_change()" id="file">          </div>    </div> 

the problem here can't value of $_files["file"]["name"]

why , how can fix it?

your form hasn't specified multipart/form-data file uploads

change form , set proper enctype

<form name="updatearticle" method="post" enctype='multipart/form-data'>