OverLord Shell

<?php
/*
@Purpose: add company job into database
@Author: Rajahree
@CreatedOn: 4 May 2016
@ModifiedOn: 4 May 2016
*/
error_reporting(0);
session_start();
include("db/conn.php");
//include_once("header.inc.php");
//include("sidebar.php");
if(!isset($_SESSION['company_id']) || !isset($_SESSION['company_name'])){session_destroy();echo "login.php";exit;}
if(!in_array($_SESSION['loggedin_user'],array('admin','company'))){echo "404.php";exit;}
if($_SERVER['REQUEST_METHOD']!='POST' || empty($_POST)){echo "404.php";exit;}

$company_name=$_POST['company_name'];
 $job_description = htmlentities($_POST['about'],ENT_QUOTES);	
    $patterns = array();
 $patterns[0] = '/([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)/';
    $patterns[1] = '/([0-9]+[\- ]?[0-9]{9}+)/';
	$patterns[2] = '/([0-9]{2,}-[0-9]{0,}-[0-9]{0,})/';
	$patterns[3] =  "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

	
    $replacements = array();
    $replacements[0] = '';
    $replacements[1] = '';
	$replacements[2] = '';
	$replacements[3] = '';

    //should use just one call of preg_replace for perfomance issues
      $string = preg_replace($patterns, $replacements, $job_description);
//echo  "UPDATE busdir_mst_all_company SET about='". $string."' WHERE my_company_id='".$_POST['my_company_id']."'";

$r=$connection->query("UPDATE busdir_mst_all_company SET about='". $string."' WHERE my_company_id='".$_POST['my_company_id']."'");


if($r)echo success;
else echo "An Unknown error occured. Please try again.";
?>