• PHP Variables.

    A variable can have a short name (like x and y) or a more descriptive name (age,         carname, total_volume).

    Rules for PHP variables:

• A variable starts 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).

• Operation Variables (like Sum)

• Output Variables.

• Output Second.php File ......

Thanks .....Enjoy the Program .....