PHPSESSID Helper functions

sessions.php

<?php

function decode_session($data){
  $temp = $_SESSION;
  session_decode($data);
  $out = $_SESSION;
  $_SESSION = $temp;
  return $out;
}

function encode_session($data){
	$temp = $_SESSION;
  $_SESSION = $data;
  $out = session_encode();
  $_SESSION = $temp;
  return $out;
}

function delete_session($id){
	$session_file = session_save_path() . "sess_" . $id;
	if (file_exists($session_file)) {
		return unlink($session_file);
	} else {
		return -1;
	}
}

function overwite_session($session_id, $data){
	$sess = session_save_path() . "sess_" . $session_id;
	if (file_exists($sess)) {
		$sessionFile = fopen($sess, "w");
		if (is_writable($sess)) {
			fwrite($sessionFile, encode_session($data));
		}
	}
}

function get_session_data($hash){
	$file = session_save_path() . "sess_" . $hash;
	if (file_exists($file)) {
		return decode_session(file_get_contents($file));
	}
}