Custom Wordpress Thumbnail Names

custom-wordpress-thumbnail-names.php

<?php

/* Custom Wordpress Thumbnail Names
 * https://gist.github.com/meek2100/e5ac625a975569fbfe13177d4021baaf
 *
 * Inspired by original code from these sources since their methods were outdated and not functional on PHP 8:
 * 1 - http://bradt.ca/archives/image-crop-position-in-wordpress/
 * 2 - http://wordpress.stackexchange.com/q/51920/12615
 * 3 - https://wordpress.stackexchange.com/questions/102420/add-suffix-to-filename-of-uploaded-images
 */

add_filter( 'wp_generate_attachment_metadata', 'dt_generate_attachment_metadata', 10, 2 );

/**
 * Run our own resizing functions by hooking into
 * the 'wp_generate_attachment_metadata' filter
 */

function dt_generate_attachment_metadata( $metadata, $attachment_id ) {
	$attachment = get_post( $attachment_id );

	$uploadPath = wp_upload_dir();
	$file = path_join($uploadPath['basedir'], $metadata['file']);

	if ( !preg_match('!^image/!', get_post_mime_type( $attachment )) || !file_is_displayable_image( $file ) ) return $metadata;

	global $_wp_additional_image_sizes;

	foreach ( get_intermediate_image_sizes() as $s ) {
		$sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => FALSE );
		if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
			$sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
		else
			$sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
		if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )
			$sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes
		else
			$sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
		if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
			$sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop'];
		else
			$sizes[$s]['crop'] = get_option( "{$s}_crop" );
	}

	foreach ( $sizes as $size => $size_data ) {
		$resized = dt_image_make_intermediate_size( $file, $size_data['width'], $size_data['height'], $size, $size_data['crop'] );
		if ( $resized )
			$metadata['sizes'][$size] = $resized;
	}

	return $metadata;
}


/**
 * Resize an image to make a thumbnail or intermediate size.
 *
 * The returned array has the file size, the image width, and image height. The
 * filter 'image_make_intermediate_size' can be used to hook in and change the
 * values of the returned array. The only parameter is the resized file path.
 *
 * @param string $file File path.
 * @param int $width Image width.
 * @param int $height Image height.
 * @param bool|array $crop Optional, default is false. Whether to crop image to specified height and width or resize. An array can specify positioning of the crop area.
 * @return bool|array False, if no image was created. Metadata array on success.
 */
function dt_image_make_intermediate_size($file, $width, $height, $size, $crop = false ) {
	if ( $width || $height ) {
		switch($size) {
			case 'thumbnail':
				$suffix = 'small';
				break;
			case 'medium':
				$suffix = 'medium';
				break;
			case 'large':
				$suffix = 'large';
				break;
			default:
				return false;
		}
		$resized_file = wp_get_image_editor($file);
		if ( ! is_wp_error( $resized_file ) ) {
			$resized_file->resize( $width, $height, $crop );
			$filename = $resized_file->generate_filename( $suffix );
			$resized_file->save($filename);
		}
		if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($filename) ) {
			$filename = apply_filters('image_make_intermediate_size', $filename);
			return array(
				'file' => wp_basename( $filename ),
				'width' => $info[0],
				'height' => $info[1],
			);
		}
	}
	return false;
}