Sort Images by Number in PHP - php

Question

I am trying to get my image slides to display in order by number with the following:
$image=array();
$img_folder = $params->get('path');
mt_srand((double)microtime()*1000);
if(is_dir($img_folder)){
krsort($file);
$imgs = dir($img_folder);
while ($file = $imgs->read()) {
if ((eregi("gif", $file) || eregi("jpg", $file) || eregi("png", $file)))
$image[] = "$file";
} closedir($imgs->handle);
print_r($image);
return $image;
}
However, the array works but the order is off:
Array ( [0] => Slide1.png [1] => Slide10.png [2] => Slide11.png [3] => Slide12.png [4] => Slide13.png [5] => Slide14.png [6] => Slide15.png [7] => Slide16.png [8] => Slide17.png [9] => Slide18.png [10] => Slide19.png [11] => Slide2.png [12] => Slide20.png [13] => Slide21.png [14] => Slide22.png [15] => Slide23.png [16] => Slide24.png [17] => Slide25.png [18] => Slide26.png [19] => Slide27.png [20] => Slide28.png [21] => Slide29.png [22] => Slide3.png [23] => Slide30.png [24] => Slide31.png [25] => Slide4.png [26] => Slide5.png [27] => Slide6.png [28] => Slide7.png [29] => Slide8.png [30] => Slide9.png )
If I put natsort($image); after $image[] = "$file"; the order is correct but the array is off:
Array ( [0] => Slide1.png [11] => Slide2.png [22] => Slide3.png [25] => Slide4.png [26] => Slide5.png [27] => Slide6.png [28] => Slide7.png [29] => Slide8.png [30] => Slide9.png [1] => Slide10.png [2] => Slide11.png [3] => Slide12.png [4] => Slide13.png [5] => Slide14.png [6] => Slide15.png [7] => Slide16.png [8] => Slide17.png [9] => Slide18.png [10] => Slide19.png [12] => Slide20.png [13] => Slide21.png [14] => Slide22.png [15] => Slide23.png [16] => Slide24.png [17] => Slide25.png [18] => Slide26.png [19] => Slide27.png [20] => Slide28.png [21] => Slide29.png [23] => Slide30.png [24] => Slide31.png )
I need them to order Slide1 - Slide30, not like listed above. I could change the names from numeric (Slide1) to alphabetic (SlideA) but would like to keep this naming convention. Is there a way to do this without changing the image names?
This image slide is a "how to" slide show.

Answer 1

NatSort is what you are looking for.
just use natsort($image);
You can reference it at:
http://php.net/manual/es/function.natsort.php

Answer 2

I didn't know about natsort(), this should do it too though..
$imgs = scandir(dir($img_folder));
$sorted = array();
foreach($imgs as $img){
$index = intval(trim($img, "Slide.png"));
$sorted[$index] = $img;
}
ksort($sorted);
$sorted = array_values($sorted);

Answer 3

You can use natsort() function
natsort
e.g.
$array1 = array("img12.png", "img10.png", "img2.png", "img1.png");
natsort($array);
print_r($array);
This way you will get out put is :
Array ( [3] => img1.png [2] => img2.png [1] => img10.png [0] => img12.png )
You can also use natcasesort($image). It sort an array using a case insensitive "natural order" algorithm.

Answer 4

This did the trick!!!
Just after
$image[] = "$file";
I added
sort($image, SORT_NATURAL | SORT_FLAG_CASE);
This correctly orders the images in the array and the order:
Array ( [0] => Slide1.png [1] => Slide2.png [2] => Slide3.png [3] => Slide4.png [4] => Slide5.png [5] => Slide6.png [6] => Slide7.png [7] => Slide8.png [8] => Slide9.png [9] => Slide10.png [10] => Slide11.png [11] => Slide12.png [12] => Slide13.png [13] => Slide14.png [14] => Slide15.png [15] => Slide16.png [16] => Slide17.png [17] => Slide18.png [18] => Slide19.png [19] => Slide20.png [20] => Slide21.png [21] => Slide22.png [22] => Slide23.png [23] => Slide24.png [24] => Slide25.png [25] => Slide26.png [26] => Slide27.png [27] => Slide28.png [28] => Slide29.png [29] => Slide30.png [30] => Slide31.png )