Создаем превьюшки для изображений

<?php

set_time_limit(0);
$directory = 'img/mems';
$images = array_filter( scandir($directory), function($name) { return preg_match('/\.jpg/i', $name); } );
$size = 150;

foreach ($images as $image) {
    $src = imagecreatefromjpeg("$directory/$image");
    $width = imagesx($src);
    $height = imagesy($src);
    $proportion = $width / $height;

    if ($width > $height) {
        $thumb_width = $size;
        $thumb_height = $size / $proportion;
    }
    else {
        $thumb_width = $size * $proportion;
        $thumb_height = $size;
    }

    $dst = imagecreatetruecolor($thumb_width, $thumb_height);
    imagecopyresampled($dst, $src, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height);
    imagejpeg($dst, "$directory/thumbs/$image");
}

?>