Create thumbnails from the pictures of current folder

makeThumbnails.php

<?php

function createThumbnail($file)
{
    $width = 220;
    $height = 220;
    $thumbPath = "thumbs/";
    list($width_orig, $height_orig, $type) = getimagesize($file);
    if (($width_orig > $width) || ($height_orig > $height)) {
        if (($width_orig > $width) && ($height_orig > $height)) {
            if ($width_orig > $height_orig) {
                $k = ($width / $width_orig);
            } else {
                $k = ($height / $height_orig);
            }
        } else {
            if ($width_orig > $width) {
                $k = ($width / $width_orig);
            } elseif ($height_orig > $height) {
                $k = ($height / $height_orig);
            } else {
                $k = 1;
            }
        }
        $width = round($width_orig * $k);
        $height = round($height_orig * $k);
        $small = imagecreatetruecolor($width, $height);
        imagefilledrectangle($small, 0, 0, $width, $height, imagecolorallocate($small, 255, 255, 255));
        switch ($type) {
            case 1 :
                $im = imageCreateFromGif($file);
                break;
            case 2 :
                $im = imageCreateFromJpeg($file);
                break;
            case 3 :
                $im = imageCreateFromPng($file);
                break;
            case 6 :
                $im = imageCreateFromBmp($file);
                break;
        }
        imagecopyresampled($small, $im, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
        imagejpeg($small, $thumbPath . $file, 90);
        imagedestroy($im);
        imagedestroy($small);
    } else {
        copy($file, $thumbPath . $file);
    }

}

if (!file_exists('thumbs')) {
    mkdir('thumbs', 0777, true);
}

foreach (glob("*.{jpg,png,gif}", GLOB_BRACE) as $filename) {
    createThumbnail($filename);
    echo "$filename - ok\n";
}