Upload and process an image in Wordpress

upload-and-process.php

<?php
$image = abjj_upload_image('profile_picture', $existing_image, 'abjj_process_profile_picture' );
echo '<pre style="font-size: 11px;">RESULT: ---------------------------', "\n", 
htmlspecialchars( print_r( $image, true)), 
'</pre>';
exit;

// Other functions
// Either process and upload a new image, or retrieve the old image
// $process is a callback that allows the image to be processed once uploaded via Wordpress' image editor
// $process( $img_editor, $the_upload )
// Note: Be sure to use $the_upload by reference to affect the uploaded image. Update any parameters that change during the processing!
function abjj_upload_image( $FILES_name, $old_image = false, $process = false ) {
  $image = false;
  
  // Start with the old image if available:
  if (isset($old_image)) $image = $old_image;
  
  // Check if old image should have been deleted:
  // Check if the delete box was checked
  if (
    isset($_POST[$FILES_name . '-delete']) 
    && isset($_POST[$FILES_name . '-delete']['checkbox'])
  ) {
    // Return nothing, as we don't want to store an image anymore
    return false;
  }
  
  // Check if new image was uploaded:
  if (
    isset($_FILES)
    && isset($_FILES[$FILES_name])
    && isset($_FILES[$FILES_name]['error'])
    && $_FILES[$FILES_name]['error'] != 4 // File was not uploaded
  ):
  
    // File was uploaded, begin processing
    $the_upload = wp_handle_upload( $_FILES[$FILES_name], array('test_form' => false) );
    
    if ( // Ignore this unknown error that can occur sometimes
      !isset($the_upload['error']) 
      || $the_upload['error'] != 'Specified file failed upload test.'
    ) {

      // Check if the upload contains a file, which means success!
      if ( isset($the_upload['file']) ) {
        
        // Add some more wonderful options to the uploaded file
        $the_upload['filename'] = basename($the_upload['file']);
        $the_upload['filesize'] = filesize($the_upload['file']);
        $the_upload['is_image'] = true;
        $the_upload['width'] = false;
        $the_upload['height'] = false;
        
        $img_editor = wp_get_image_editor( $the_upload['file'] );
        
        if ( $img_editor ) {
          $image_size = $img_editor->get_size();
        
          if ( isset($image_size['width']) ) 
            $the_upload['width'] = $image_size['width'];
            
          if ( isset($image_size['height']) ) 
            $the_upload['height'] = $image_size['height'];
        }
        
        if ( $process !== false && function_exists($process) ) {
          // Before we start processing, store our original image in an index called "original"
          $the_upload['original'] = $the_upload;
        
          $process( $img_editor, $the_upload );
        }
        
        // The upload  went OK, save our results
        $image = $the_upload;
      }
    
    }
  
  endif; 
  // End of handling upload
  
  
  return $image;
}

// Resize image to a maximum of 225x200, Preserve aspect ratio, Do not scale up
// Save as jpg 80%
function abjj_process_profile_picture( &$editor, &$upload ) {
  $w = $upload['width'];
  $h = $upload['height'];
   
  $max_w = 225;
  $max_h = 200;
  
  if ($w > 225 || $h > 200) {
    $is_landscape = ($max_w / $w) < ($max_h / $h);
    $ratio = $is_landscape ? $max_w / $w : $max_h / $h;
    
    $w = round($w * $ratio);
    $h = round($h * $ratio);
    
    $editor->resize( $w, $h, true );
    
  }
  
  // Strip the trailing extension from the name
  /*
  //$upload_path = str_replace($upload['filename'], '', $upload['file']);
  $new_name = preg_replace('/\.[^\.]+$/', '', $upload['filename']);
  $new_name = $new_name . '-' . uniqid() . '.jpg';
  */
  $upload_path = dirname( $upload['file'] );
  $new_name = $editor->generate_filename( uniqid(), $upload_path,  'jpg' );
  
  
  $editor->set_quality( 80 );
  $result = $editor->save( $new_name, 'image/jpeg' );
  
  if ($result) {
    $upload_dir = wp_upload_dir();
  
    $upload['width'] = $w;
    $upload['height'] = $h;
    $upload['file'] = $new_name;
    $upload['filename'] = basename($new_name);
    $upload['filesize'] = filesize($new_name);
    $upload['type'] = 'image/jpeg';
    $upload['url'] = $upload_dir['url'] . '/' . basename($new_name);
    
    $upload['processed'] = 1;
  }
}