php session variable problem when unset

Question

i have made a function to set a session variable $_SESSION['flash'] in order to store a message between page

function setFlash($string,$type="info") {

    switch ($type) {
        case "warning":
            $_SESSION['flashtype'] = "warning";
            break;
        case "error":
            $_SESSION['flashtype'] = "error";
            break;
        case "info":
            $_SESSION['flashtype'] = "info";
            break;
        default:
            $_SESSION['flashtype'] = "info";
            break;
    }
    $_SESSION['flash'] = $string;   
}

and a function to print this message

function printFlash() {
      echo $_SESSION['flash'];
      unset($_SESSION['flash']);

}

i call this function at the top of every page (naturally after session_start)

the problem is that it doesn't print nothing, but if I comment " unset($_SESSION['flash']);" it prints the message in every page.

how can i solve?

Solved sorry my fault.

my page is something like this

include "func.inc.php"
session start

function editSomething {
  that call setFlash()
  }

include "template.php" (where printFlash() is called)

now i put printFlash directly in my page and works..bah strange...what's my mistake?

well...i have some file inclusion for my classes => session_start() => printFlash()....than i have a call to a function that edit a record in the db and if ok => setFlash("Flash Message") => redirect to another page with the same classes inclusion => session_start() => printFlash....the problem is that seems that the unset statement is done before than echo statement — Matteo
– Matteo, Commented Sep 21, 2011 at 10:28

Cyrbil · Accepted Answer · 2011-09-21 10:18:02Z

0

On every page this is what happened:

Make a session
Display flash
Delete flash
Create 'flash' with value

You have to move Create before display.

(it's also not very usefull because you do not transmit 'flash' (it's delete right after been created)

answered Sep 21, 2011 at 10:18

Cyrbil

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3 Comments

Matteo Over a year ago

Cyrbil Over a year ago

So it's seems right, since we had no code to work with, possible errors are: Next page haven't session_start(); -- Session is destroy before the next page

Matteo Over a year ago

the second page have session_start on the top and if i remove "unset" from the "printFlash" function the second page print the message

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