php session variable value destroyed after reaload page in wordpress

Question

I have a problem with sessions in wordpress. First I've activated the use of sessions in my functions.php and no I get the right variable but just after I reload my target site after setting the variable. When I load another page first and my target page seacondly my variable has a wrong value without any context to my first value. When I have the right value on my target site and I reload this site the value is also wrong. This is my code:

 //Activate sessions() in functions.php add_action('init', function(){ if(!session_id()) { session_start(); } }, 1); //Calculate the variable $gesamtumsatz_kcal = round (($value1 + $value2 + $value3), 0); //Then set the session variable $_SESSION['gesamtumsatz_kcal'] = $gesamtumsatz_kcal; //Get my session variable on another page somewhere on my site if(isset($_SESSION['gesamtumsatz_kcal'])) { $gesamtumsatz_kcal = $_SESSION['gesamtumsatz_kcal']; } else { $gesamtumsatz_kcal = ''; } //Echo my variable echo $gesamtumsatz_kcal; 

Do you have any idea whats wrong? I'm absolutely at the end with this....

Thanks a lot!

• • • • • • • • I have to add this

When I define a constant variable without calculate something like this:

 //Define the variable $_SESSION['test'] = 1056; //Get the variable $test = $_SESSION['test']; //Echo the variable echo $test; 

I always get the right value: 1056 back... What is this? Can't uderstand

Answer 1

wordpres destroys session when it is not opened. so use

if(!session_id()) session_start();

in the start of wp-config.php or better in the init of your code/plugin