PHP Function with Optional Parameters

Question

I\'ve written a PHP function that can accepts 10 parameters, but only 2 are required. Sometimes, I want to define the eighth parameter, but I don\'t want to type in empty st

Answer 1

function yourFunction($var1, $var2, $optional = Null){
   ... code
}

You can make a regular function and then add your optional variables by giving them a default Null value.

A Null is still a value, if you don't call the function with a value for that variable, it won't be empty so no error.

Answer 2

In PHP 5.6 and later, argument lists may include the ... token to denote that the function accepts a variable number of arguments. The arguments will be passed into the given variable as an array; for example:

Example Using ... to access variable arguments

<?php
function sum(...$numbers) {
    $acc = 0;
    foreach ($numbers as $n) {
        $acc += $n;
    }
    return $acc;
}

echo sum(1, 2, 3, 4);
?>

The above example will output:

10

Variable-length argument lists PHP Documentation