PHP Variables

PHP Variables is very interesting, its just like a container. PHP Variables data transfer from one place to another place.

Note: PHP Variables start with $ sign.

Basic Example:

<?php
$a= 20;
echo $a;
?>

Result: 20

There are two types of Variables:

• Predefined Variable
• User define Variables
  

1. Predefined Variables:

These variables are available in PHP program. There is no need to declare and define these variable in the program.

These are following type of Predefined Variable.

Predefined Variables = Super Define Variables.

$_GET

$_POST

$_COOKIE

$_SESSION

$_FILES

$_ENV

$_REQUEST

$_SERVER

2. User define Variable:

This variable is declare and define by developers

For Example:

$ontime=50;

$ontime is a variable and 50 is a data and this data store in variable $num. So we can use this variable for print the value of 50 at any where as per requirement.

Benefit of PHP Variable: PHP automatically converts the variable to correct data type, depending on value.

Example:

<?php
$a=30;
$b=50;
$c=$a+$b;
echo "First Number is $a"."<br>";
echo "Second Number is $b"."<br>";
echo "Result is $c";
?>

Output:

First Number is 30

Second Number is 50

Result is 80

Personal Recommendation: Check PHP Examples and start practicing.