Answers for "php read method request"

php get

<form action="/" method="get">
  <input type="text" name="name">
  <br>
  <input type="submit">
</form>
<?php
  echo $_GET["query"];
?>

what does $request do in php

$message = "";

if($_REQUEST['msg'] == "new"){
    $message = "New User has been added successfully";
}else if($_REQUEST['msg'] == 'edit'){
    $message = "User has been saved successfully";
}else if($_REQUEST['msg'] == 'update'){
    $message = "User(s) has been Updated successfully";
}