预填充SESSION [SESS_PREFIX

Question

On my home page there is a link to another page.. when I go from my homepage to let say the order page.. the order page is working..

But when I go to my order page directly.. I got an error:

Notice: Undefined index: banner_type on line 33

// line 33

$_SESSION[SESS_PREFIX .'type'] = $_POST['banner_type'];

the prefill must be kozijnen.. what code can i use for the order page to work. when I visit it directly?

if ( isset ( $_SESSION[SESS_PREFIX .'type'] ) ) {



    // check flyer

    if ( $_SESSION[SESS_PREFIX .'type'] == "kozijnen" ) {

I need to hard code the kozijnen into my order page..

this is a part off the code from my home page:

$value ) { // output //echo ''; } ?> Postcode Straal 10 km 25 km 50 km 100 km Overal Werkzaamheden $value ) { echo ''. $value .''; } ?> --->

and this from my order page..

/ chek sessions step1

if ( !isset($_SESSION[SESS_PREFIX .'postal']) OR !isset($_SESSION[SESS_PREFIX .'radius']) OR !isset($_SESSION[SESS_PREFIX .'type']) ) {

// fill in

$_SESSION[SESS_PREFIX .'type'] = $_POST['banner_type'];




// check isset submit

if ( isset ( $_POST['banner_search_submit'] ) ) {

    header("Location: ". $_SERVER['REQUEST_URI']);

}

}

// check step 2

if ( isset ( $_POST['gotostep2'] ) OR isset ( $_POST['adjuststep1'] ) ) {

$_SESSION[SESS_PREFIX .'type'] = $_POST['type'];

}

-- / check type isset

//echo ( isset ( $$_SESSION[SESS_PREFIX .'type'] = "kozijnen" ) {

if ( isset ( $_SESSION[SESS_PREFIX .'type'] ) ) {

// check flyer

if ( $_SESSION[SESS_PREFIX .'type'] == "kozijnen" ) {

Answer 1

Deducted from the comments, what you were looking for is called a ternary operator

It can be used in a different set of ways but in general it's used to assign a "default" value if no value is present.

And one of the way it works are like so:

$value = (CHECK) ? <VALUE IF CHECK PASSES> : <VALUE IF CHECK FAILS>;

As stated in comments you should / could use it like so:

$_SESSION[SESS_PREFIX .'type'] = isset($_SESSION[SESS_PREFIX .'type']) ? $_SESSION[SESS_PREFIX .'type'] : 'kozijnen';