PHP Function Parameters

Scope can be defined as the range of availability a variable has to the program in which it is declared. PHP variables can be one of four scope types:

• Local variables
• Function parameters
• Global variables
• Static variables

NOTE: PHP Functions are covered in detail in PHP Function Chapter.

But in short a function is a small unit of program which can take some input in the form of parameters and does some processing and may return a some value.

Function Parameters:

Function parameters are declared after the function name and inside parentheses. They are declared much like a typical variable would be:

<? // multiply a value by 10 and return it to the caller function multiply ($value) { $value = $value * 10; return $value; } $retval = multiply (10); Print "Return value is $retval\n"; ?>

This will produce following result.

Return value is 100