//隐藏wordpress版本号
remove_action('wp_head', 'wp_generator');

//去除后台没必要的功能
function disable_dashboard_widgets() { 
remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal');//近期评论 
remove_meta_box('dashboard_recent_drafts', 'dashboard', 'normal');//近期草稿
remove_meta_box('dashboard_primary', 'dashboard', 'core');//wordpress博客 
remove_meta_box('dashboard_secondary', 'dashboard', 'core');//wordpress其它新闻 
remove_meta_box('dashboard_right_now', 'dashboard', 'core');//wordpress概况 
remove_meta_box('dashboard_incoming_links', 'dashboard', 'core');//wordresss链入链接 
remove_meta_box('dashboard_plugins', 'dashboard', 'core');//wordpress链入插件 
remove_meta_box('dashboard_quick_press', 'dashboard', 'core');//wordpress快速发布 
} 
add_action('admin_menu', 'disable_dashboard_widgets');
//移除 WordPress 加载的JS和CSS链接中的版本号
function wpdaxue_remove_cssjs_ver( $src ) {
if( strpos( $src, 'ver=' ) )
$src = remove_query_arg( 'ver', $src );
return $src;
}
add_filter( 'style_loader_src', 'wpdaxue_remove_cssjs_ver', 999 );
add_filter( 'script_loader_src', 'wpdaxue_remove_cssjs_ver', 999 );
//移除自动保存
wp_deregister_script('autosave');
//移除修订版本
remove_action('post_updated','wp_save_post_revision' );
//后台禁用Google Open Sans字体，加速网站
add_filter( 'gettext_with_context', 'wpdx_disable_open_sans', 888, 4 );
function wpdx_disable_open_sans( $translations, $text, $context, $domain ) {
if ( 'Open Sans font: on or off' == $context && 'on' == $text ) {
$translations = 'off';
}return $translations;
}

//部分内容进行加密
function e_secret($atts, $content=null){
 extract(shortcode_atts(array('key'=>null), $atts));
 if(isset($_POST['e_secret_key']) && $_POST['e_secret_key']==$key){
 return '
<div class="e-secret">'.$content.'</div>
';
 }
 else{
 return '
<form class="e-secret" action="'.get_permalink().'" method="post" name="e-secret"><label>输入密码查看加密内容：</label><input type="password" name="e_secret_key" class="euc-y-i" maxlength="50"><input type="submit" class="euc-y-s" value="确定">
<div class="euc-clear"></div>
</form>
';
 }
}
add_shortcode('secret','e_secret');

//关闭rss feed功能
function disable_all_feeds() {
wp_die(__('<h1>本博客不提供Feed，请访问网站<a href="'.get_bloginfo('url').'">首页</a>！</h1>'));
}
add_action('do_feed', 'disable_all_feeds', 1);
add_action('do_feed_rdf', 'disable_all_feeds', 1);
add_action('do_feed_rss', 'disable_all_feeds', 1);
add_action('do_feed_rss2', 'disable_all_feeds', 1);
add_action('do_feed_atom', 'disable_all_feeds', 1);

//清理header
remove_action( 'wp_head', 'feed_links', 2 ); //去除文章feed
remove_action( 'wp_head', 'rsd_link' ); //针对Blog的远程离线编辑器接口
remove_action( 'wp_head', 'wlwmanifest_link' ); //Windows Live Writer接口
remove_action( 'wp_head', 'parent_post_rel_link', 10, 0 ); //移除后面文章的url
remove_action( 'wp_head', 'start_post_rel_link', 10, 0 ); //移除最开始文章的url
remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );//自动生成的短链接
remove_action( 'wp_head', 'wp_generator' ); // 移除版本号
remove_action('wp_head', 'index_rel_link');//当前文章的索引
remove_action('wp_head', 'feed_links_extra', 3);// 额外的feed,例如category, tag页
remove_action('wp_head', 'adjacent_posts_rel_link', 10, 0); // 上、下篇.
remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0 );//rel=pre
wp_deregister_script('l10n');
remove_filter('the_content', 'wptexturize');//禁用半角符号自动转换为全角
add_filter('run_wptexturize', '__return_false');//禁用转义
remove_action('wp_head', 'wp_resource_hints', 2);//禁用类似rel='dns-prefetch' href='//fonts.g(oogle)apis.com'
 
//移除wp-json
add_filter('json_enabled', '__return_false' );
add_filter('json_jsonp_enabled', '__return_false' );
 
remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
remove_action( 'wp_head', 'wp_oembed_add_discovery_links', 10 );

#禁用找回密碼和屏蔽找回密碼按鈕 function.php
function disable_reset_lost_password() {
    return false;
}
add_filter( 'allow_password_reset', 'disable_reset_lost_password');
add_action('login_head', 'ygj_login_head');
function ygj_login_head() {
?>
    <style type="text/css">
        #nav,#login_error,.login-action-lostpassword {
            display: none;
       }
    </style>
<?php
}

# 限制登录次数，防止暴力破解，超过5次失败尝试后禁用登录15mins
add_action('wp_login_failed', function($username){
	$key	= $_SERVER['REMOTE_ADDR'];
	$times	= wp_cache_get($key, 'wpjam_login_limit');
	$times	= $times ?: 0;
	wp_cache_set($key, $times+1, 'wpjam_login_limit', MINUTE_IN_SECONDS*15);
});
add_filter('authenticate', function($user, $username, $password){
	$key	= $_SERVER['REMOTE_ADDR'];
	
	$times	= wp_cache_get($key, 'wpjam_login_limit');
	$times	= $times ?: 0;

	if($times > 5){
		remove_filter('authenticate', 'wp_authenticate_username_password', 20, 3);
		remove_filter('authenticate', 'wp_authenticate_email_password', 20, 3);

		return new WP_Error('too_many_retries', '已尝试多次失败登录，15分钟后重试！');
	}

	return $user;
}, 1, 3 );

// Remove Open Sans that WP adds from frontend   
if (!function_exists('remove_wp_open_sans')):
function remove_wp_open_sans() {   
wp_deregister_style( 'open-sans' );   
wp_register_style( 'open-sans', false );   
}
// 前台删除Google字体CSS   
add_action('wp_enqueue_scripts', 'remove_wp_open_sans');
// 后台删除Google字体CSS   
add_action('admin_enqueue_scripts', 'remove_wp_open_sans'); 
endif;