A Variable is a holder used to store both numeric and non-numeric data.
Rules for Variable declaration
- In PHP, variable starts with a dollar($) sign, succeeded by the name of the variable.
- In PHP, a variable name must start with a letter or the underscore character.
- In PHP, a variable name only contains alpha-numeric characters and underscores (A-Z,a-z, 0-9, and _).
- A variable name must not contain space.
Assigning Values to Variables
<?php $name = "infovistar"; echo $name; ?>
Example (Addition of two numbers):
<?php $a = 10; $b = 15; $c = $a + $b; echo $c; ?>