<?php
$data = [
'image_name_1.jpg',
'image_name_5.jpg',
'image_name_2.jpg',
'image_name_88.jpg',
'image_name_11.jpg',
'image_name_100.jpg',
'image_name_001.jpg',
];
sort($data, SORT_NATURAL
);
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array (
0 => 'image_name_001.jpg',
1 => 'image_name_1.jpg',
2 => 'image_name_2.jpg',
3 => 'image_name_5.jpg',
4 => 'image_name_11.jpg',
5 => 'image_name_88.jpg',
6 => 'image_name_100.jpg',
)