我为WordPress编写了很多插件,现在我想让它们适应MU.为了"升级"我的插件以支持多站点安装,我必须遵循/避免/适应
哪些考虑/最佳实践/工作流/功能/陷阱？
例如,但不限于:
$wpdb在Codex中,有时在单一功能描述中有关于Multisite的评论,但我找不到任何一站式页面来解决这个问题.
bra*_*ilo 68
至于入队和包括,事情就像平常一样.插件路径和URL是相同的.
我从未处理过与Multisite上传路径有关的任何事情,我想通常WP负责这一点.
$wpdb有一个常用的代码片段可以遍历所有博客:
global $wpdb;
$blogs = $wpdb->get_results("
SELECT blog_id
FROM {$wpdb->blogs}
WHERE site_id = '{$wpdb->siteid}'
AND spam = '0'
AND deleted = '0'
AND archived = '0'
");
$original_blog_id = get_current_blog_id();
foreach ( $blogs as $blog_id )
{
switch_to_blog( $blog_id->blog_id );
// do something in the blog, like:
// update_option()
}
switch_to_blog( $original_blog_id );
您可以找到使用的示例restore_current_blog()代替switch_to_blog( $original_blog_id ).但这就是为什么switch更可靠:restore_current_blog()vs switch_to_blog().
$blog_id根据博客ID执行一些功能或挂钩:
global $blog_id;
if( $blog_id != 3 )
add_image_size( 'category-thumb', 300, 9999 ); //300 pixels wide (and unlimited height)
或者可能:
if(
'child.multisite.com' === $_SERVER['SERVER_NAME']
||
'domain-mapped-child.com' === $_SERVER['SERVER_NAME']
)
{
// do_something();
}
使用插件标题Network: true (请参阅:示例插件)将仅显示页面中的插件/wp-admin/network/plugins.php.使用此标头,我们可以使用以下内容阻止在插件仅为网络时发生的某些操作.
function my_plugin_block_something()
{
$plugin = plugin_basename( __FILE__ );
if( !is_network_only_plugin( $plugin ) )
wp_die(
'Sorry, this action is meant for Network only',
'Network only',
array(
'response' => 500,
'back_link' => true
)
);
}
对于(De)激活,它取决于每个插件.但是,对于卸载,这是我在文件中使用的代码uninstall.php:
<?php
/**
* Uninstall plugin - Single and Multisite
* Source: https://wordpress.stackexchange.com/q/80350/12615
*/
// Make sure that we are uninstalling
if ( !defined( 'WP_UNINSTALL_PLUGIN' ) )
exit();
// Leave no trail
$option_name = 'HardCodedOptionName';
if ( !is_multisite() )
{
delete_option( $option_name );
}
else
{
global $wpdb;
$blog_ids = $wpdb->get_col( "SELECT blog_id FROM $wpdb->blogs" );
$original_blog_id = get_current_blog_id();
foreach ( $blog_ids as $blog_id )
{
switch_to_blog( $blog_id );
delete_option( $option_name );
}
switch_to_blog( $original_blog_id );
}
要添加管理菜单,我们检查是否is_multisite()并相应地修改了挂钩:
$hook = is_multisite() ? 'network_' : '';
add_action( "{$hook}admin_menu", 'unique_prefix_function_callback' );
// Check for MS dashboard
if( is_network_admin() )
$url = network_admin_url( 'plugins.php' );
else
$url = admin_url( 'plugins.php' );
如果不创建网络管理员菜单(动作挂钩network_admin_menu),则可以仅在主站点中显示插件的某些部分.
我开始在我最大的插件中包含一些Multisite功能,并执行以下操作将插件选项的一部分限制到主站点.这意味着,如果在子站点中激活插件,则该选项将不会显示.
$this->multisite = is_multisite()
? ( is_super_admin() && is_main_site() ) // must meet this 2 conditions to be "our multisite"
: false;
再看一遍,也许它可以简单地说:is_multisite() && is_super_admin() && is_main_site().请注意,最后两个返回true单个站点.
然后:
if( $this->multisite )
echo "Something only for the main site, i.e.: Super Admin!";
钩:network_admin_menu,wpmu_new_blog,signup_blogform,wpmu_blogs_columns,manage_sites_custom_column,manage_blogs_custom_column,wp_dashboard_setup,network_admin_notices,site_option_active_sitewide_plugins,{$hook}admin_menu
功能:is_multisite,,,,,,is_super_admin is_main_siteget_blogs_of_userupdate_blog_optionis_network_adminnetwork_admin_urlis_network_only_plugin
PS:我宁愿链接到WordPress Answers而不是Codex,因为会有更多的工作代码示例.
我刚刚推出了一个Multisite插件,Network Deactivated但Active Elsewhere,并在下面制作了一个非工作的恢复注释版本(请参阅GitHub以获得完整的完整工作版本).完成的插件纯粹是功能性的,没有设置界面.
请注意,插件标题有Network: true.它可以防止插件在子站点中显示.
<?php
/**
* Plugin Name: Network Deactivated but Active Elsewhere
* Network: true
*/
/**
* Start the plugin only if in Admin side and if site is Multisite
*/
if( is_admin() && is_multisite() )
{
add_action(
'plugins_loaded',
array ( B5F_Blog_Active_Plugins_Multisite::get_instance(), 'plugin_setup' )
);
}
/**
* Based on Plugin Class Demo - https://gist.github.com/toscho/3804204
*/
class B5F_Blog_Active_Plugins_Multisite
{
protected static $instance = NULL;
public $blogs = array();
public $plugin_url = '';
public $plugin_path = '';
public static function get_instance()
{
NULL === self::$instance and self::$instance = new self;
return self::$instance;
}
/**
* Plugin URL and Path work as normal
*/
public function plugin_setup()
{
$this->plugin_url = plugins_url( '/', __FILE__ );
$this->plugin_path = plugin_dir_path( __FILE__ );
add_action(
'load-plugins.php',
array( $this, 'load_blogs' )
);
}
public function __construct() {}
public function load_blogs()
{
/**
* Using "is_network" property from $current_screen global variable.
* Run only in /wp-admin/network/plugins.php
*/
global $current_screen;
if( !$current_screen->is_network )
return;
/**
* A couple of Multisite-only filter hooks and a regular one.
*/
add_action(
'network_admin_plugin_action_links',
array( $this, 'list_plugins' ),
10, 4
);
add_filter(
'views_plugins-network', // 'views_{$current_screen->id}'
array( $this, 'inactive_views' ),
10, 1
);
add_action(
'admin_print_scripts',
array( $this, 'enqueue')
);
/**
* This query is quite frequent to retrieve all blog IDs.
*/
global $wpdb;
$this->blogs = $wpdb->get_results(
" SELECT blog_id, domain
FROM {$wpdb->blogs}
WHERE site_id = '{$wpdb->siteid}'
AND spam = '0'
AND deleted = '0'
AND archived = '0' "
);
}
/**
* Enqueue script and style normally.
*/
public function enqueue()
{
wp_enqueue_script(
'ndbae-js',
$this->plugin_url . '/ndbae.js',
array(),
false,
true
);
wp_enqueue_style(
'ndbae-css',
$this->plugin_url . '/ndbae.css'
);
}
/**
* Check if plugin is active in any blog
* Using Multisite function get_blog_option
*/
private function get_network_plugins_active( $plug )
{
$active_in_blogs = array();
foreach( $this->blogs as $blog )
{
$the_plugs = get_blog_option( $blog['blog_id'], 'active_plugins' );
foreach( $the_plugs as $value )
{
if( $value == $plug )
$active_in_blogs[] = $blog['domain'];
}
}
return $active_in_blogs;
}
}
与插件开发没有直接关系,但对多站点管理至关重要.
这些电子书由不少于两个巨人阵容:Mika Epstein(又名Ipstenu)和Andrea Rennick撰写.