<?php

  /**
   * Title : Aqua Resizer
   * Description : Resizes WordPress images on the fly
   * Version : 1.1.6
   * 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
   * @uses wp_upload_dir()
   * @uses wp_get_image_editor()
   *
   * @return str|array
   */

  function aq_resize( $url, $width, $height = null, $crop = null, $single = true ) {

    //validate inputs
    if(!$url OR !$width ) return false;

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

    //check if $img_url is local
    if(strpos( $url, $upload_url ) === false) 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];
    $dst_h = $dims[5];

    //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(!$dst_h) {
      //can't resize, so return original url
      $img_url = $url;
      $dst_w = $orig_w;
      $dst_h = $orig_h;
    }
    //else check if cache exists
    elseif(file_exists($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 {

      // Note: This pre-3.5 fallback check will edited out in subsequent version
      if(function_exists('wp_get_image_editor')) {

        $editor = wp_get_image_editor($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;
        }

      } else {

        //$resized_img_path = image_resize( $img_path, $width, $height, $crop ); // Fallback foo
        $resized_img_path = wp_get_image_editor( $img_path ); // Fallback foo
        if(!is_wp_error($resized_img_path)) {
          $resized_img_path->resize( $width,$height, $crop );
          $resized_img_path->save( $img_path );
          $resized_rel_path = str_replace( $upload_dir, '', $resized_img_path);
          $img_url = $upload_url . $resized_rel_path;
        } else {
          return false;
        }

      }

    }

    //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;
  }