Media Functions

extraImageNameChoose.php

<?php
/**
 * Add Extra Image sizes
 *
 * Add extra image size to chosen select
 *
 * @param  array $list The list of the default wordpress image sizes
 * @return array $list The filtered image sizes
 */
add_filter( 'image_size_names_choose', function( $list ) {

	$_images = get_intermediate_image_sizes();

	if ( empty( $_images ) ) {
		return $list;
	}

	foreach ( $_images as $index => $item ) {
		$list[ sanitize_key( $item ) ] = ucwords( preg_replace( '/[^a-z0-9]/', ' ', $item ) );
	}

	return $list;
} );

showFileSize.php

<?php
/**
 * Add Media Column
 *
 * @param array $columns The media table list columns
 *
 * @return array $columns The filtered columns
 */
add_filter( 'manage_media_columns', function ( $columns ) {
	$columns['size'] = __( 'Size' );

	return $columns;
} );

/**
 * Add Size
 *
 * @param string $column_name The current media table column
 * @param int    $post_id     The current media post ID
 *
 * @return void
 */
add_action( 'manage_media_custom_column', function ( $column_name, $post_id ) {
	if ( 'size' === $column_name ) {
		echo size_format( filesize( get_attached_file( $post_id ) ) );
	}
}, 10, 2 );