PHP Function, Cookies, Session examples -

1. PHP Program to use of user-defined function.

<?php
function msg()
{
echo "Hello from msg function!";
}

function test()
{
echo "Hello from test function!";
}

test();
echo "<hr>";
msg();
?>

Output of above code is…

2. PHP Program to use of function with parameters.

<?php
function add($a, $b)
{
$c=$a+$b;
echo "sum=", $c;
}
add(2,5);
?>

3. PHP Program to create cookies.

<html>
   <head>
    <title>Set Cookies</title>
   </head>

<?php
setcookie("username", "Raj", time()+120, "/","", 0);
setcookie("age", "50", time()+120, "/", "",  0);
setcookie("country", "India", time()+120, "/", "",  0);
?>
   
  <body>
    <?php echo "Setting Cookies..." ?>
   </body>
   
</html>

4. PHP Program to retrieve cookies values [from above program]

  <?php
echo "<h1>Fetching Cookies Value </h1>";
         echo $_COOKIE["username"]. "<br>";
         echo $_COOKIE["age"] . "<br>";
         echo $_COOKIE["country"] . "<br>";
      ?>

5. PHP Program to retrieve server information using super global variables.

<?php 
echo "<h1> PHP Superglobal variables </h1>"; 
echo "Location:",$_SERVER['SERVER_NAME'];
echo "<br>";
echo "Port number:",$_SERVER['HTTP_HOST'];
echo "<br>";
echo "Browser info:", $_SERVER['HTTP_USER_AGENT'];
echo "<br>";
echo "File name:", $_SERVER['SCRIPT_NAME'];
?>

Output of the program is…

6. PHP Program to use of SESSIONS.

<?php
   session_start();
   if( isset( $_SESSION['c'] ) ) 
{
 $_SESSION['c'] += 1;
}

else
{
$_SESSION['c'] = 1;
}
    
 $msg = "You are visitor number : ". $_SESSION['c'];
?>
<?php  echo ( $msg ); ?>

Above program produces following output.

7. PHP example to demonstrate destroy the sessions.

<?php
session_start();
session_destroy();
echo "<h1> Session destroyed!</h1>";
?>

And the output is…

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