Question: I'm kinda of new in android. How can i send an email automatically without a contact chooser. 
I write a list of e-mails in edittext and an message and then i want to send to every email address. 
How can i do that?

Answer: 
Is `array_filter` is the method your looking for. I guess there are enough ways to do this :)

```
$array = [0, 15, 60, 120, 2200];
$number = 15;
$filtered = array_filter($array, function($element) use ($number) {
   return ($element <= $number);
});
// $filtered = [0, 15];

$max = max($filtered); //15

```
You can also use this function:

```
function get_less_value($arr, $number) {

    // Always sort the array first
    sort($arr);
    $i = 0;

    $biggest = 0;

    while ($number >= $arr[$i]) {
        $biggest = $arr[$i];
        $i++;
    }

    return $biggest;
}

echo get_less_value($arr, $number);

```

This is the naive solution and may work slow if your array would be very big.
Have a look at search algorithms. e.g: [Binary Search](https://en.wikipedia.org/wiki/Binary_search_algorithm)

Another PDF about the algorithms: <http://epaperpress.com/sortsearch/download/sortsearch.pdf>