How to post data to web page form and get response using php

<form method="post" action="">
<input type="text" class="form-control" name="name" placeholder="some name">
<input type="text" class="form-control" name="code" placeholder="123456">
<input type="submit" class="btn btn-info" value="Submit" name="submit" />
</form>
<br>

<?php
//submit data

if (isset($_POST['submit'])) {
 
echo $_POST['name']."<br/>";
echo $_POST['code']."<br/>";

}



?>

that was my index.php and i want to post data into this form from another web page and get response by using php