arrays - PHP array_filter with arguments

Question

I have the following code:

function lower_than_10($i) {
    return ($i < 10);
}

that I can use to filter an array like this:

$arr = array(7, 8, 9, 10, 11, 12, 13);
$new_arr = array_filter($arr, 'lower_than_10');

How can I add arguments to lower_than_10 so that it also accepts the number to check against? Like, if I have this:

function lower_than($i, $num) {
    return ($i < $num);
}

how to call it from array_filter passing 10 to $num or whatever number?

Answer 1

if you a using php 5.3 and above, you can use closure to simplify your code:

$NUM = 5;
$items = array(1, 4, 5, 8, 0, 6);
$filteredItems = array_filter($items, function($elem) use($NUM){
    return $elem < $NUM;
});