remove unnecessary page post meta boxes in WordPress

removemetaboxes.php

// remove unnecessary page/post meta boxes
function remove_meta_boxes() {

	// posts
	remove_meta_box('postcustom','post','normal');
	remove_meta_box('trackbacksdiv','post','normal');
	remove_meta_box('commentstatusdiv','post','normal');
	remove_meta_box('commentsdiv','post','normal');
	remove_meta_box('categorydiv','post','normal');
	remove_meta_box('tagsdiv-post_tag','post','normal');
	remove_meta_box('slugdiv','post','normal');
	remove_meta_box('authordiv','post','normal');

	// pages
	remove_meta_box('postcustom','page','normal');
	remove_meta_box('commentstatusdiv','page','normal');
	remove_meta_box('trackbacksdiv','page','normal');
	remove_meta_box('commentsdiv','page','normal');
	remove_meta_box('slugdiv','page','normal');
	remove_meta_box('authordiv','page','normal');

}
add_action('admin_init','remove_meta_boxes');