PHP Variable

Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive ($age and $AGE are two different variables). Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. Variable name cannot start with a number

Creating or Declaring PHP Variables

It is not necessary to initialize variables in PHP however it is a very good practice.

<?php 
$txt="I love PHP Programming";
$x=5;
$y=10;
?>

Output Variable

PHP echo statement is often used to output data to the screen.

<?php 
echo "I love PHP Programming";
$x=5;
$y=10;
echo $x+$y;
echo "My Rating is ".$x;
?>

PHP automatically associates a data type to the variable, depending on its value. Since the data types are not set in a strict sense, you can do things like adding a string to an integer without causing an error.