PHP reserved variable Session


$_SESSION


$HTTP_SESSION_VARS


$_SESSION -- $HTTP_SESSION_VARS [deprecated] — Session variables


An associative array containing session variables available to the current script. See the Session functions documentation for more information on how this is used.


$HTTP_SESSION_VARS contains the same initial information, but is not a superglobal. (Note that $HTTP_SESSION_VARS and $_SESSION are different variables and that PHP handles them as such)


This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script. There is no need to do global $variable; to access it within functions or methods.


		  	 <?php 
				session_start();
				/*session is started if you don't write this line can't use $_Session  global variable*/
				$_SESSION["newsession"]=$value;
				?>
				Getting Session
				==========================
				<?php 
				session_start();
				/*session is started if you don't write this line can't use $_Session  global variable*/
				$_SESSION["newsession"]=$value;
				/*session created*/
				echo $_SESSION["newsession"];
				/*session was getting*/
				?>
				Updating Session
				==========================
				<?php 
				session_start();
				/*session is started if you don't write this line can't use $_Session  global variable*/
				$_SESSION["newsession"]=$value;
				/*it is my new session*/
				$_SESSION["newsession"]=$updatedvalue;
				/*session updated*/
				?>
				Deleting Session
				==========================
				<?php 
				session_start();
				/*session is started if you don't write this line can't use $_Session  global variable*/
				$_SESSION["newsession"]=$value;
				unset($_SESSION["newsession"]);
				/*session deleted. if you try using this you've got an error*/
			  ?>
		  

	      		<?php

					session_start();

					$_SESSION['test'] = 42;
					$test = 43;
					echo $_SESSION['test'];

				?>
	      



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