show image dimensions in wordpress media library #wordpress

show-mediasize.php

//show image dimentions in media library
function wh_column( $cols ) {
    $cols["dimensions"] = "Dimensions";
    return $cols;
}
function wh_value( $column_name, $id ) {
    $meta = wp_get_attachment_metadata($id);
    if(isset($meta['width']))
        echo ' ' . $meta['width'].' x '.$meta['height'] . 'px';
}
add_filter( 'manage_media_columns', 'wh_column' );
add_action( 'manage_media_custom_column', 'wh_value', 10, 2 );