Question

What could be the reason for having this:

public function __construct($host, $port, $timeout = 5){
    $errnum = 0;
    $errstr = ''; 

Instead of this:

public function __construct($host, $port, $errnum = 0, $errstr = '', $timeout = 5){

?

Why some are params and others aren’t ?

Thanks a lot,
MEM

Answer 1

A function definition defines a contract between the function itself and the code that calls it.

A variable should only be a parameter if the caller should specify it’s value. Otherwise if a variable is only used internally by the function, there is no need to specify it as a parameter.