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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 −
<?php
// 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 the following result −
Return value is 100
php_variable_types.htm
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