What are the variables in PHP

• Variables are containers that store data (like text, numbers, etc.) within your PHP code.
• They act like temporary storage locations for information that your script needs to use.

How to Declare a Variable:

• All PHP variables start with a dollar sign ($).
• Example: $name, $age, $price, $product_id.

Naming Variables:

• Variables are Case-sensitive which means $name and $Name are considered different variables.

• Variables can contain letters (a-z, A-Z), numbers (0-9), underscores (_), and dollar signs ($).

• A variable must start with a letter, underscore, or dollar sign.

• A variable cannot start with a number.

Example:

<?php
$A = "Hello How are You"; 
echo $A; 
$Num = 3.12;
echo $Num;
?>

In this example:

• This PHP code declares two variables, a string $A with the value “Hello How are You” and a float $Num with the value 3.12, and then outputs their values to the browser.