Variables
Variables
Variables are containers used to store information in a program.
A variable can have a short name like $x or $y, or a more meaningful name like $age, $carName, $totalVolume to make the code easy to understand.
In PHP, a variable is used to store data values such as text, numbers, or other information that can be used later in the program.
All PHP variables start with a dollar sign ($) followed by the variable name.
Rules for PHP Variables
- A variable must start with the $ sign, followed by the name of the variable
- A variable name must start with a letter or the underscore character
- A variable name cannot start with a number
- A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
- Variable names are case-sensitive ($age and $AGE are two different variables)
Example
$x = 5;
$y = "John";
echo $x;
echo "\n";
echo $y;
?>