Creating a PHP Session using jQuery / JS

Question

On page load, I want to check if a PHP Session variable exists:

If it does, alert() the contents
If it doesn't, create it and save the current time

Here is my code:

$(document).ready(function(){

  <?php if(session_id() == '') { session_start(); } ?>

  if (!<?php echo isset($_SESSION['lbBegin'])?'true':'false'; ?>) {
    <?php $_SESSION['lbBegin'] = date("Y-m-d H:i:s"); ?>
  } else {
    alert("<?php echo $_SESSION['lbBegin']; ?>")
  }

});

This code works in the sense that the first page load doesn't produce an alert() and a refresh shows the time, however every refresh / link click afterwards changes the time. I was expecting the time to stay the same during the entire session.

What have I done wrong?

You have a few mistakes. I have corrected them and posted the final code. Kindly have a look at my answer. :) — Praveen Kumar Purushothaman
– Praveen Kumar Purushothaman, Commented Jan 18, 2016 at 11:02
I don't know what you want to achieve, but mixing js and php code is clearly a bad idea, you should think about a better way of implementing client/server communication. — n00dl3
– n00dl3, Commented Jan 18, 2016 at 11:06

Praveen Kumar Purushothaman · Accepted Answer · 2016-01-18 10:58:54Z

You need to add session_start() at the very beginning and check if a session variable exists. Do this way:

<?php session_start(); // At the very top! No matter what! ?>
<script>
$(document).ready(function(){

  if (!<?php echo isset($_SESSION['lbBegin']) ? 'true' : 'false' ; ?>) {
    // And you cannot do the below thing, because, first PHP executes before JS even runs. So, you need to use an AJAX Call for this:
    <?php $_SESSION['lbBegin'] = date("Y-m-d H:i:s"); ?>
  } else {
    alert("<?php echo $_SESSION['lbBegin']; ?>")
  }

});
</script>

Correcting the AJAX Bit:

<?php session_start(); // At the very top! No matter what! ?>
<script>
$(document).ready(function(){

  if (!<?php echo isset($_SESSION['lbBegin']) ? 'true' : 'false' ; ?>) {
    // And you cannot do the below thing, because, first PHP executes before JS even runs. So, you need to use an AJAX Call for this:
    $.getScript("setTime.php");
  } else {
    alert("<?php echo $_SESSION['lbBegin']; ?>")
  }

});
</script>

Inside the setTime.php add the code:

<?php $_SESSION['lbBegin'] = date("Y-m-d H:i:s"); ?>

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