CODEWITHSUNDEEP
phpjqueryajax
user3796133
user3796133

Reputation: 348

Can SESSION variables be slow to set or unset?

i was just wondering if a SESSION variable can be sometimes slow to set/unset?

To be honest I'm not sure how to test exactly how quick a SESSION becomes set or unset but i have noticed when i use an ajax call to set/unset a SESSION variable about 10% of the time the code in the ajax callback function executes before the SESSION variable is set/unset.

I have put a setTimeout in the callback function to have it wait a second before it executes to code and this seems eliminate the problem, though it kind of seems like a bad fix. Is it considered bad practice to do something like that?

Learner here, be kind :-)

jQuery 

$("#whatever_button").click(function(){  

    var $x = "1";

    $.ajax({      
        url: "filename.php",
        data: { set_session: $x},
        type: "post",
        dataType: "text",
        success: function(response){
            if (response == "1"){

               //delay execution for 1 second
               setTimeout(function(){
                   //Place code here
               }, 1000);

            } else alert("Something went wrong.");
        },
    });
});

PHP

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

    unset($_SESSION['variable']);    //unset session variable
    echo "1";
}

Upvotes: 1

Views: 1432

Answers (1)

baao
baao

Reputation: 73251

A session is stored in a file, so depending on your server it can take some milliseconds to save it, though I would hardly doubt that this will ever be noticeable unless you have set your session_save_path to a 1985' floppy drive with a barely working floppy in it.

More interesting is the purpose you are aiming for, as you don't return anything related to the newly unset $_SESSION['variable'].

Maybe you should include a test to see if the session is unset

unset($_SESSION['variable']);
if ( ! isset($_SESSION['variable'])) return '1';

If you want to check times, you can allways make use of php's microtime() function. 

$time_start = microtime(true);
unset($_SESSION['variable']);
$time_end = microtime(true);
$time = $time_end - $time_start;

echo "$time seconds";

Upvotes: 1

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