Boiler plate ajax.php file

Hello, I am /ajax.php
To make me work properly please send GET or POST data
I am designed to not need editing, all the things you want to add to my functionality
should be written in a file called /home/cyr/public_html/inc/ajax.txt
Also, I am intelligent enough to see there is no /home/cyr/public_html/inc/ajax.txt
I leave it up to you to create that.
Below is /home/cyr/public_html/ajax.php source code
===============================
<?php
if(isset($_GET['test'])) { error_reporting(E_ALL);ini_set('display_errors', '1'); }
if(isset($_POST['test'])) { error_reporting(E_ALL);ini_set('display_errors', '1'); }
header("Content-Type: text/plain");
$page=getenv("SCRIPT_NAME"); 
$query=getenv("QUERY_STRING");
$referer=getenv("HTTP_REFERER"); 
$ip=getenv("REMOTE_ADDR");
$docRoot=getenv('DOCUMENT_ROOT');
if(isset($_GET['test'])) { foreach($_GET as $name => $value) { print "\n".$name." : ".$value; } die();}
if(isset($_POST['test'])) { foreach($_POST as $name => $value) { print "\n".$name." : ".$value; } die();}
$includesDir="inc";
$includesDir=getcwd()."/".$includesDir;
$file=$includesDir."/".basename($page,"php")."txt";
if((count($_GET) < 1) && (count($_POST) < 1)) {
 print "Hello, I am ".$page."\n";
 print "To make me work properly please send GET or POST data\n";
 print "I am designed to not need editing, all the things you want to add to my functionality\n";
 print "should be written in a file called ".$file."\n";
  if(!is_dir($includesDir)) { print "Also, I see there is no ".$includesDir."\nPlease create this directory and place a file named '".basename($page,"php")."txt' in it";}   
  elseif(!is_file($file)) { print "Also, I am intelligent enough to see there is no ".$file."\nI leave it up to you to create that.\n"; }
  
  print "Below is ".$_SERVER['SCRIPT_FILENAME']." source code\n===============================\n";
  print file_get_contents($_SERVER['SCRIPT_FILENAME']);
  print "\n";
 if (is_file($file)) {
 print "Below is ".$file." source code\n===============================\n";
  print file_get_contents($file);
 } 
 die();
                                               }  
is_file($file) ?  include($file) : print $file." does not exist"; 
die();
?>