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✏️ Editing: retina-upload.php

<?php

function pixflow_retina_upload_filter($metadata ){

//Check for errors
    if(!count($metadata) ||
       !array_key_exists('file', $metadata) ||
       !array_key_exists('sizes', $metadata) )
        return $metadata;

$upload   = wp_upload_dir();
    $relPath  = dirname($metadata['file']);
    $path     = pixflow_path_combine($upload['basedir'], $relPath);
    $sizes    = $metadata['sizes'];

//Check for @2x extension
    foreach($sizes as $key => $size)
    {
        if(!pixflow_ends_with($key, '@2x'))
            continue;

//key without @2x
        $id = substr($key, 0, strlen( $key ) - 3);

//Check for normal resolution key
        if(!array_key_exists($id, $sizes))
            continue;

//Change the file name to match the LoDPI one
        //Except we add @2x to the filename
        $file = $sizes[$id]['file'];
        $ext  = pathinfo($file, PATHINFO_EXTENSION);
        $fileName = basename($file, ".$ext");
        $newName  = "$fileName@2x.$ext";

//Rename the file
        rename(pixflow_path_combine($path, $sizes[$key]['file']), pixflow_path_combine($path, $newName));

//Save the new name
        $metadata['sizes'][$key]['file'] = $newName;
    }

return $metadata;
}

add_filter('wp_generate_attachment_metadata', 'pixflow_retina_upload_filter');

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