Scan dir, create php array with new keys starting from 1 and rising with each file found (all my keys are [1])

Trying to scan a directory then put the files it finds into an array which I can then later call in a for each loop but not getting the results I desire with my current code...

<?php

$files = scandir('audio');
foreach ($files as $file) {

$arr = array($file);
$iOne = array_combine(range(1, count($arr)), array_values($arr));
echo "<pre>";
print_r($iOne);
echo "</pre>";

}

?>
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produces..

Array
(
    [1] => .
)

Array
(
    [1] => ..
)

Array
(
    [1] => audio1.mp3
)

Array
(
    [1] => audio2.mp3
)

Array
(
    [1] => audio3.mp3
)

Array
(
    [1] => audio4.mp3
)
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When I wanted

Array
(
    [1] => audio1.mp3
    [2] => audio2.mp3
    [3] => audio3.mp3
    [4] => audio4.mp3
)
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Note I also removed. &.. from the second output.

I'm very new to PHP and arrays and as such despite me reading several similar questions it is my lack of understanding that is stopping me achieve my desired results. Thanks in advance.

EDIT: I've tried the answer suggested by Nick

<?php
$files = scandir('audio');
$files = array_slice($files, 2);
$files = array_combine(range(1, count($files)), $files);
foreach ($files as $file) {
echo "<pre>";
print_r($file);
echo "</pre>";
}
?>
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but this displays..

audio1.mp3
audio2.mp3
audio3.mp3
audio4.mp3
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not

 Array
    (
        [1] => audio1.mp3
        [2] => audio2.mp3
        [3] => audio3.mp3
        [4] => audio4.mp3
    )
Copy code

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