WordPress - various removers

wordpres-various-removers.php

<?php

/**
 * Various removers
 * todo: all may not be still needed/usefull/correct
 */

/**
 * @param $headers
 *
 * @return mixed
 * remove xpingback header
 */
function x_pingback_head( $headers ) {
	unset( $headers['X-Pingback'] );

	return $headers;
}

add_filter( 'wp_headers', __NAMESPACE__ . '\\x_pingback_head' );

/**
 * remove header info
 */
function remove_header_info() {
	remove_action( 'wp_head', 'feed_links_extra', 3 );
	remove_action( 'wp_head', 'rsd_link' );
	remove_action( 'wp_head', 'wlwmanifest_link' );
	remove_action( 'wp_head', 'wp_generator' );
	remove_action( 'wp_head', 'start_post_rel_link' );
	remove_action( 'wp_head', 'index_rel_link' );
	remove_action( 'wp_head', 'parent_post_rel_link', 10 );
	remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 ); // for WordPress >= 3.0
}

add_action( 'init', __NAMESPACE__ . '\\remove_header_info' );

/**
 * @return string
 */
function head_remove_version() {
	return '';
}

add_filter( 'the_generator', __NAMESPACE__ . '\\head_remove_version' );
add_filter( 'the_generator', '__return_false' );

/**
 * @param $matches
 *
 * @return string
 * helper for replacing query var of asset from remove_wp_assets_qvar()
 */
function removeVersionCallback( $matches ) {
	return 'ver=' . md5( print_r( $matches, true ) . "" );
}

/**
 * @param $src
 *
 * @return mixed|string
 * Remove assets query var
 * can be bypassed when forcing nginx pagespeed to process assets from queried URL
 * By default, pagespeed does not rewrite them
 */
function remove_wp_assets_qvar( $src ) {
	$src = preg_replace_callback( '/ver=[^&]*/', __NAMESPACE__ . '\\removeVersionCallback', $src );
	if ( strpos( $src, 'ver=' ) ) {
		$src = remove_query_arg( 'ver', $src );
	}

	return $src;
}

add_filter( 'style_loader_src', __NAMESPACE__ . '\\remove_wp_assets_qvar', 9999 );
add_filter( 'script_loader_src', __NAMESPACE__ . '\\remove_wp_assets_qvar', 9999 );

/**
 * Redirect back helper
 */
function redirect_back() {
	if ( wp_get_referer() ) {
		wp_safe_redirect( wp_get_referer() );
	} else {
		wp_safe_redirect( get_home_url() );
	}
}