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PHP how to handle _GET/_POST without duplicating the code base
if($_POST)
{
//then work with the post data
}
if($_GET)
{
//then work with the get data
}

function doOperation($var)
{
   //then work with the var data
}

if(isset($_POST))
{
   doOperation($_POST);
}

if(isset($_GET))
{
   doOperation($_GET);
}

function process($params)
{
  //then work with the params
}

if(isset($_POST))
{
  process($_POST);
}
if(isset($_GET))
{
  process($_GET);
}

if($_SERVER["REQUEST_METHOD"] == "POST") {
$_GET = $_POST;
}

if($_POST)
   $varToUse = $_POST;

else if($_GET)
   $varToUse = $_GET;

else
   $varToUse = 'default case';

//> Process with $varToUse;