Global/Super Global Variables in PHP:

In PHP there are so many global variables are defined. Global variable means that variable can be always accessed in a function or in a class or in a file. We also called them as a Super Global Variable.

Here is a list of PHP Super global Variables:

  • $GLOBALS
  • $_SERVER
  • $_REQUEST
  • $_POST
  • $_GET
  • $_FILES
  • $_SESSION
  • $_COOKIE

 $GLOBALS in PHP:

You have already learn that the variable which is define outside a function is a global variable which can be accessed globally anywhere in PHP code.

To use them inside a function use “$GLOBAL[index]” array.

Example:

 $_SERVER in PHP:

The $_SERVER PHP global variable holds all the information about the server like information about header, script location, server name, etc.

Example:

 $_REQUEST variable in PHP:

In PHP the $_REQUEST operator is used to send data after submitting the HTML form.

You can use $_REQUEST variable to collect data if you are using “Get” method or you are using “Post” method means it will work for both methods.

Example: The code is divided into two parts the HTML code and the PHP code

In following example we are using POST method and collecting data from $_REQUEST variable

Below is the HTML code of program

Following is the PHP code of program

 $_POST Variable in PHP:

We have already learn the Post method in our “Get and Post method in PHP” topic. So when you are using a post method at that time you have to use $_POST variable to collect data.

$_POST variable is widely use to collect data because the security reasons.

Example: The code is divided into two parts the HTML code and the PHP code

First we create a HTML form and save as “index.html”

Now we will create a PHP page and save it as “send.php”

 $_GET Variable in PHP:

We have already learn the GET method in our “Get and Post method in PHP” topic. When you are sending data using get method than use the $_GET variable to collect the data in PHP.

This variable is used when we want that the data should be display in URL.

Example:

            First we are creating a HTML page and save it with index.html name:

Now we are creating “send.php” page because the action is send.php

 Note:

The “$_FILES”, “$_SESSION”, and “$_COOKIE” we will cover these variables in separate topics.

One response to “Global/Super Global Variables in PHP”

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