[RESOLVED] Switch & Session

[Nightcat]

OK here's the code

switch (true){

case ($_POST['cardType']=='recognize'):
    
    //$card_id=$_POST['card_id'];
    $_SESSION['card1']=$_POST['card_id'];
    echo $_SESSION['card1'];
    $table=display_cards('realize');

break;


case ($_POST['cardType']=='realize'):
    
    //$card_id=$_POST['card_id'];
    $_SESSION['card2']=$_POST['card_id'];
    echo $_SESSION['card2'];
    $table=display_cards('reconnect');

break;


case ($_POST['cardType']=='reconnect'):
    
    //$card_id=$_POST['card_id'];
    $_SESSION['card3']=$_POST['card_id'];
    echo $_SESSION['card3'];
    $table=display_cards('receive');

break;


case ($_POST['cardType']=='receive'):
    
    
    $_SESSION['card4']=$_POST['card_id'];
    echo $_SESSION['card2'];
    echo $_SESSION['card4'];
    
break;


default:
    
    session_start();
    $_SESSION['card1']='';
    $_SESSION['card2']='';
    $_SESSION['card3']='';
    $_SESSION['card4']='';
    
    $table=display_cards('recognize');

break;
} 

It seems that this code resets the session variables every time I run it, so I end up only with the last one that was set.

I just can't understand why, as the default shouldn't run if one of the others is true

[Nightcat]

OK

I tried using

elseif 

but it still wipes out all the variables except the last one set

[steve42lawson]

Perhaps your POST variables contain whitespace (assuming their content came from some sort of interface). Try:

case (trim($_POST['cardType'])=='reconnect'): 

or

case (strstr($_POST['cardType'], 'reconnect') !== false): 

or for case-insensitive case

case (stristr($_POST['cardType'], 'reconnect') !== false): 

Also, try applying the following test to your POST data:

isset($_POST['cardType']) 

BTW: Have you looked at the POST data to see if the strings you are testing for are really there?

echo "\$_POST['cardType']: ***{$_POST['cardType']}***"; 

[the stars ('***') are to make whitespace stand out.]

Also, are you sure you have the case right on your key: 'cardType'? Perhaps the following test will reveal something:

var_dump($_POST); 

[Nightcat]

I've found a problem.

Basicaly, whenever I was writing my code, I would declare a session only in "default" part of the switch statement. This ment that whenever page loaded with any data POSTED to it, the session was not declared and the variables seem to not have been saved.

The solution seems to be writing session_start() in every instance of the "switch" statement.

[steve42lawson]

Doh! Didn't even notice that -- so what if you place the session_start(); call before the switch statement [preferably at the top of the PHP block, before any other PHP code]? Does that eliminate the need for the multiple session_start(); calls within the switch statement?

[Nightcat]

There's been some problem with it, but I think it's down to the fact that I was declaring session variable on the top as well, so one would have to declare them in the "default" part of the switch statement