if or php

if (!isset($_SESSION['M_valid_user']) || !isset($_SESSION['O_valid_user'] ))
the syntax is correct, as for it not catching the or part ..well you will have to debug your program
for bugs, the problem is not here!

It cant be as the "do this" occurs when
$_SESSION['M_valid_user'] is not set but not $_SESSION['O_valid_user'].

I even tried switching it around and which ever Session I mention first triggers the "do this" but not the second..
N

Output your variables before to see:


echo $_SESSION['M_valid_user'];
echo $_SESSION['O_valid_user'];

if (!isset($_SESSION['M_valid_user']) || !isset($_SESSION['O_valid_user'] )) {
// something
}

Hmm There may be another one problem that is you may not have started your session here I have a small piece of code for you check this one may help you

session_start();
$_SESSION['M_valid_user']="jagadish";
$_SESSION['O_valid_user']="someone";
if (!isset($_SESSION['M_valid_user']) || !isset($_SESSION['O_valid_user'] )){
	echo "Session not set";
	}else{
	echo $_SESSION['M_valid_user']."<br/>";
	echo $_SESSION['O_valid_user']."<br/>";
	}

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A small note though,
it will check the or condition i.e. it will process !isset($_SESSION['O_valid_user']) only if !isset($_SESSION['M_valid_user']) is false.

Can you plz paste the output of

var_dump(!isset($_SESSION['M_valid_user']));
var_dump(!isset($_SESSION['O_valid_user']));

Probably $_SESSION is always 'set', so i think You coud use:

if( $_SESSION['M_valid_user'] == '' || $_SESSION['O_valid_user'] == '' )
{
//do
}

This one has me stumped.. Everything is in place and working (session is set and variables working etc). However whichever session variable I choose to use first works and the second is ignored.
I will re write the script to achieve my goals an alternate way..
N

This worked although the solution is not as efficient as if the "or" had worked.

if (isset($_SESSION['M_valid_user'])){
			  echo 
           ' black space'; } else 		   
			if (isset($_SESSION['O_valid_user'])){
			echo 
           ' bank space'; } else{
				echo 
           ' my content';
			}

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Change this

if (!isset($_SESSION['M_valid_user']) || !isset($_SESSION['O_valid_user'] )) {


to

if (!isset($_SESSION['M_valid_user']) || isset(!$_SESSION['O_valid_user'] )) {

A difficult challenge as the answer I came up with in the end differed quite a lot from the answer I originally intended to acquire via this question. I am awarding aboo_s the points as his last  post was thorough and the de bugging tips that aboo_s suggested eventually helped me find a better solution.
Cheers
N