session in php

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Session is used to store some values on different pages without permanent storage like in database . Some variable may have session values and those values may be accessed on next pages till the session is not destroyed.

Store values in Session variable in php

<?php
  session_start();
  $_SESSION['course']="PHP";
  $_SESSION['topic']="Session";
  ?>
 <a href="session-get.php">Go To Session Get Page</a>

Now we can access these session variable on other page as following.

<?php
  session_start();
  echo "Course: =".$_SESSION['course'];
  echo"<br> Topics in course:= ".$_SESSION['topic'];
  ?>
 <br><a href="session-get.php">Go To Next Page to unset session variable</a>

Destroy the session and unset the session variable

<?php
  session_unset();
  session_destroy();
  echo"Course:= ".$_SESSION['course']"; // this line will give an error 
  ?>

As session variable are unset so they can not access and it gives error on this page as follows

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session in php

Store values in Session variable in php

Destroy the session and unset the session variable

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