html - Having issues with PHP File Upload -

i trying upload file site odd reason not working. exists=true triggering means should working right? giving me $error=true;. below code:

html:

<input size="30" enctype="multipart/form-data" name="profile_icon" id="register-profile_icon" class="elgg-input-file" type="file"> 

php:

$profile_icon = $_files["profile_icon"]; if($profile_icon){     $exists=true; } $error = false; if(empty($profile_icon["name"])){     register_error(elgg_echo("profile_manager:register_pre_check:missing", array("profile_icon")));     $error = true; } 

use $_files["profile_icon"]["tmp_path"] file path.

$_files["profile_icon"] contains arrays of values name, tmp_path, type, size etc.

on note need add enctype attribute <form>.

and there function available moving upload function move_uploaded_file();