How to sort files from directory in a array in php [duplicate]

Question

I have the following code:

$imageDir = "uploads/";
$allowedTypes = array('png', 'jpg', 'jpeg', 'gif');
$dimg = opendir($imageDir);
$images = array();

while ($imgfile = readdir($dimg)) {
    if (in_array(strtolower(substr($imgfile, -3)), $allowedTypes) || (in_array(strtolower(substr($imgfile, -4)), $allowedTypes))) {
        $images[] = $imgfile;

    }
}

Basically what I need is also order the images in the $images array. For example I have image-1.png, image-2.png, image-23.png, image-3.png , I want them stored in the correct order in my $images array (1, 2, 3, 23) not (1, 2, 23, 3).

there's a natural number sort in php, see here

Amelia
– Amelia

2013-02-26 19:20:20 +00:00
Commented Feb 26, 2013 at 19:20 — Amelia
– Amelia, Commented Feb 26, 2013 at 19:20

Michael Irigoyen · Accepted Answer · 2013-02-26 19:29:35Z

1

You can use the natsort function built into PHP. This will sort them from least to greatest (in terms of numbers), numbers before letters, and so on. If you need to sort them in the opposite order, you can use an array_reverse after the sort.

Here is an example:

natsort($dirs); // Naturally sort the directories
$dirs = array_reverse($dirs); // Reverse the sorting

answered Feb 26, 2013 at 19:29

Michael Irigoyen

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1 Comment

mickmackusa Over a year ago

In one go: rsort($filepaths, SORT_NATURAL);

Amelia · Accepted Answer · 2013-02-26 19:37:53Z

You'll need to use natsort here, which sorts alphanumeric strings the way a human would.

You should also split on the last . if you're going to be trusting file extensions (but let's not get into that. You should really be checking the mime type, but that's additional work you can do as homework)

$image_dir = "uploads/";
$allowed_types = array('png', 'jpg', 'jpeg', 'gif');
$dimg = opendir($image_dir); // I vehemently follow my own style guide.
$images = array('png' => [], 'jpg' => [], 'jpeg' => [], 'gif' => []);
// all these people using pure array() when we've had the shorthand since php4...

while ($img_file = readdir($dimg)) {
    $ext = strtolower(end(explode(".", $img_file))); // end() is fun.
    if (in_array($ext, $allowed_types)) {
        $images[$ext][] = $img_file;
    }
}
foreach ($images as &$images_) { // pass-by-reference to change the array itself
    natsort($images_);
}

// $images is now sorted

Winston · Accepted Answer · 2013-02-26 19:32:13Z

0

You can try this code

$imageDir = "uploads/";
$allowedTypes = array('png', 'jpg', 'jpeg', 'gif');
$images = scandir($imageDir);

usort($images, function($file1, $file2){
    preg_match('/^image-(\d+)\./', $file1, $num1);
    preg_match('/^image-(\d+)\./', $file2, $num2);
    return $num1 < $num2 ? -1 : 1;
});

echo '<pre>' . print_r($images, 1) . '</pre>';

answered Feb 26, 2013 at 19:32

Winston

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1 Comment

Amelia Over a year ago

there's no real need to make a custom function for this when a builtin does it perfectly already, honestly. but bonus for effort.

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