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File Content: aq_resizer.php

<?php

/**
 * Title         : Aqua Resizer
 * Description   : Resizes WordPress images on the fly
 * Version       : 1.2.0
 * Author        : Syamil MJ
 * Author URI    : http://aquagraphite.com
 * License       : WTFPL - http://sam.zoy.org/wtfpl/
 * Documentation : https://github.com/sy4mil/Aqua-Resizer/
 *
 * @param string $url - (required) must be uploaded using wp media uploader
 * @param int $width - (required)
 * @param int $height - (optional)
 * @param bool $crop - (optional) default to soft crop
 * @param bool $single - (optional) returns an array if false
 * @param bool $upscale - (optional) resizes smaller images
 * @uses  wp_upload_dir()
 * @uses  image_resize_dimensions()
 * @uses  wp_get_image_editor()
 *
 * @return str|array
 */

if (!class_exists('Aq_Resize')) {
    class Aq_Resize
    {
        /**
         * The singleton instance
         */
        static private $instance = null;

/**
         * No initialization allowed
         */
        private function __construct()
        {
        }

/**
         * No cloning allowed
         */
        private function __clone()
        {
        }

/**
         * For your custom default usage you may want to initialize an Aq_Resize object by yourself and then have own defaults
         */
        static public function getInstance()
        {
            if (self::$instance == null) {
                self::$instance = new self;
            }

return self::$instance;
        }

/**
         * Run, forest.
         */
        public function process($url,
            $width = null,
            $height = null,
            $crop = null,
            $single = true,
            $upscale = false
        ) {
            // Validate inputs.
            if (!$url || (!$width && !$height)) return false;

// Caipt'n, ready to hook.
            if (true === $upscale) add_filter('image_resize_dimensions', array($this, 'aq_upscale'), 10, 6);

// Define upload path & dir.
            $upload_info = wp_upload_dir();
            $upload_dir = $upload_info['basedir'];
            $upload_url = $upload_info['baseurl'];

$http_prefix = 'http://';
            $https_prefix = 'https://';

/* if the $url scheme differs from $upload_url scheme, make them match 
               if the schemes differe, images don't show up. */
            if (!strncmp($url, $https_prefix, strlen($https_prefix))) { //if url begins with https:// make $upload_url begin with https:// as well
                $upload_url = str_replace($http_prefix, $https_prefix, $upload_url);
            } elseif (!strncmp($url, $http_prefix, strlen($http_prefix))) { //if url begins with http:// make $upload_url begin with http:// as well
                $upload_url = str_replace($https_prefix, $http_prefix, $upload_url);
            }

// Check if $img_url is local.
            if (false === strpos($url, $upload_url)) return false;

// Define path of image.
            $rel_path = str_replace($upload_url, '', $url);
            $img_path = $upload_dir . $rel_path;

// Check if img path exists, and is an image indeed.
            if (!file_exists($img_path) or !getimagesize($img_path)) return false;

// Get image info.
            $info = pathinfo($img_path);
            $ext = $info['extension'];
            list($orig_w, $orig_h) = getimagesize($img_path);

// Get image size after cropping.
            $dims = image_resize_dimensions($orig_w, $orig_h, $width, $height, $crop);
            $dst_w = $dims[4] ?? null;
            $dst_h = $dims[5] ?? null;

// Return the original image only if it exactly fits the needed measures.
            if (!$dims && (((null === $height && $orig_w == $width) xor (null === $width && $orig_h == $height)) xor ($height == $orig_h && $width == $orig_w))) {
                $img_url = $url;
                $dst_w = $orig_w;
                $dst_h = $orig_h;
            } else {
                // Use this to check if cropped image already exists, so we can return that instead.
                $suffix = "{$dst_w}x{$dst_h}";
                $dst_rel_path = str_replace('.' . $ext, '', $rel_path);
                $destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";

if (!$dims || (true == $crop && false == $upscale && ($dst_w < $width || $dst_h < $height))) {
                    // Can't resize, so return false saying that the action to do could not be processed as planned.
                    return false;
                } // Else check if cache exists.
                elseif (file_exists($destfilename) && getimagesize($destfilename)) {
                    $img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
                } // Else, we resize the image and return the new resized image url.
                else {

$editor = wp_get_image_editor($img_path);

if (is_wp_error($editor) || is_wp_error($editor->resize($width, $height, $crop)))
                        return false;

$resized_file = $editor->save();

if (!is_wp_error($resized_file)) {
                        $resized_rel_path = str_replace($upload_dir, '', $resized_file['path']);
                        $img_url = $upload_url . $resized_rel_path;
                    } else {
                        return false;
                    }

}
            }

// Okay, leave the ship.
            if (true === $upscale) remove_filter('image_resize_dimensions', array($this, 'aq_upscale'));

// Return the output.
            if ($single) {
                // str return.
                $image = $img_url;
            } else {
                // array return.
                $image = array(
                    0 => $img_url,
                    1 => $dst_w,
                    2 => $dst_h
                );
            }

return $image;
        }

/**
         * Callback to overwrite WP computing of thumbnail measures
         */
        function aq_upscale($default, $orig_w, $orig_h, $dest_w, $dest_h, $crop)
        {
            if (!$crop) return null; // Let the WordPress default function handle this.

// Here is the point we allow to use larger image size than the original one.
            $aspect_ratio = $orig_w / $orig_h;
            $new_w = $dest_w;
            $new_h = $dest_h;

if (!$new_w) {
                $new_w = intval($new_h * $aspect_ratio);
            }

if (!$new_h) {
                $new_h = intval($new_w / $aspect_ratio);
            }

$size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

$crop_w = round($new_w / $size_ratio);
            $crop_h = round($new_h / $size_ratio);

$s_x = floor(($orig_w - $crop_w) / 2);
            $s_y = floor(($orig_h - $crop_h) / 2);

return array(0, 0, (int)$s_x, (int)$s_y, (int)$new_w, (int)$new_h, (int)$crop_w, (int)$crop_h);
        }
    }
}

if (!function_exists('aq_resize')) {

/**
     * This is just a tiny wrapper function for the class above so that there is no
     * need to change any code in your own WP themes. Usage is still the same :)
     */
    function aq_resize($url, $width = null, $height = null, $crop = null, $single = true, $upscale = false)
    {
        $aq_resize = Aq_Resize::getInstance();
        $external_url = $aq_resize->process($url, $width, $height, $crop, $single, $upscale);
        return !empty($external_url) ? $external_url : $url;
    }
}