浏览器后退按钮表单字段为空

Question

I have session_start in all my code and this is working. When I click the browser back button and when i include this in my header.php file:

header_remove("Expires");
header_remove("Cache-Control");
header_remove("Pragma");
header_remove("Last-Modified")

the session variable $_SESSION['IAMAVARIABLE'] DOES NOT print/echo on the screen. But my form fields value appears. when i comment this out:

/*
header_remove("Expires");
header_remove("Cache-Control");
header_remove("Pragma");
header_remove("Last-Modified")
*/

the session variable $_SESSION['IAMAVARIABLE'] print/echo and my form fields value disappear.

I want both of them at to show at all times when i click the browser back button. any ideas what i am doing wrong. many thanks for your responses.

Answer 1

From Php.net

header_remove

Caution

This function will remove all headers set by PHP, including cookies, session and the X-Powered-By headers.

Missing a semicolon

header_remove("Last-Modified")
                              ^

It must be

header_remove("Last-Modified");