PHP Variable Length Parameter

In this chapter you will learn:

1. What is Variable Length Parameter
2. Support Functions
3. Example - Use variable length parameters

Description

A function with variable-length parameter list can take as many parameters as user want.

Support Functions

We can use three functions to make a function handle variable length parameters.

• func_num_args()
• func_get_arg(), and
• func_get_args()

func_num_args() and func_get_args() take no parameters.

• func_num_args() gets the number of arguments passed into your function.
• func_get_arg() gets the value of an individual parameter.
• func_get_args() returns an array of the parameters that were passed in.

Example

Here's an example:

<?PHP/* j  a v  a2 s  .  c  om*/
function some_func($a, $b) { 
        for ($i = 0; $i < func_num_args(); ++$i) { 
                $param = func_get_arg($i); 
                echo "Received parameter $param.\n"; 
        } 
} 

function some_other_func($a, $b) { 
        $param = func_get_args(); 
        $param = join(", ", $param); 
        echo "Received parameters: $param.\n"; 
} 

some_func(1,2,3,4,5,6,7,8); 
some_other_func(1,2,3,4,5,6,7,8); 
?>

The code above generates the following result.

Next chapter...

What you will learn in the next chapter:

1. What is a reference
2. Syntax to create reference variable
3. Reference variable
4. Syntax for reference parameters
5. Function Reference Parameters
6. Example - Reference parameter

PHP Function

PHP Function Create

PHP Function Parameter

PHP Function Default Parameters

PHP Variable Length Parameter

PHP Function Reference Parameter

PHP Function Return

PHP Return Reference

PHP Variable Scope in Functions

PHP Global Variables

PHP Recursive Functions

PHP Anonymous Function

PHP static variable