PHP - session_reset() Function

Sessions or session handling is a way to make the data available across various pages of a web application. The session_reset() function re-initializes the variables of a session with original values.
session_reset();

This function does not accept any parameters.
This function returns a boolean value which is TRUE if the session started successfully and FALSE if not.
This function was first introduced in PHP Version 4 and works in all the later versions.
Following example demonstrates the usage of the session_reset() function.
<html>   
   <head>
      <title>Setting up a PHP session</title>
   </head>   
   <body>
      <?php
         //Starting the session
         session_start();
         //Initializing the session array
         $_SESSION["A"] = "Hello";
         print("Initial value: ".$_SESSION["A"]);
         echo "<br>";		 
      ?>
   </body>   
</html> 
One executing the above html file it will display the following message −
Initial value: Hello

Then you need to execute the following file.
<html>   
   <head>
      <title>Setting up a PHP session</title>
   </head>   
   <body>
      <?php  	
         //Starting a session	  
         session_start();   
         
         //Replacing the old value
         $_SESSION["A"] = "Welcome"; 
         print("New value: ".$_SESSION["A"]);
         echo "<br>";		 
         session_reset();  
         print("Value after the reset operation: ".$_SESSION["A"]);
      ?>
   </body>   
</html>
This generates the following output.
New value: Welcome
Value after the reset operation: Hello

Following is another example of this function, in here we have two pages from the same application in the same session −
session_page1.htm
<?php
   if(isset($_POST['SubmitButton'])){ 
      //Starting the session	
      session_start();
      $_SESSION['name'] = $_POST['name'];
      $_SESSION['age']  = $_POST['age'];
   }
?>
<html>
   <body>
      <form action="#" method="post">
         <br>
         <label for="fname">Enter the values click Submit and click on Next</label>
         <br><br><label for="fname">Name:</label>
         <input type="text" id="name" name="name"><br><br>
         <label for="lname">Age:</label>
         <input type="text" id="age" name="age"><br><br>           
         <input type="submit" name="SubmitButton"/>
         <?php echo '<br><br /><a href="session_page2.htm">Next</a>'; ?>
      </form>
   </body>
</html>
This will produce the following output −
On clicking on Next the following file is executed.
session_page2.htm
<html>   
   <head>
      <title>Second Page</title>
   </head>
   <body>
      <?php
         //Session started
         session_start();
         print($_SESSION['name']); 
         echo "<br>";
         print($_SESSION['age']);
      ?>   
   </body>   
</html>

This will produce the following output −
Radha
22
Values after the reset operation:
krishna
30 


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