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

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