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<?php
/**
* class-groups-controller.php
*
* Copyright (c) "kento" Karim Rahimpur www.itthinx.com
*
* This code is released under the GNU General Public License.
* See COPYRIGHT.txt and LICENSE.txt.
*
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This header and all notices must be kept intact.
*
* @author Karim Rahimpur
* @package groups
* @since groups 1.0.0
*/
if ( !defined( 'ABSPATH' ) ) {
exit;
}
/**
* Plugin controller
*/
class Groups_Controller {
/**
* Version 2.0.0 number
*
* @var string
*/
const GROUPS_200 = '2.0.0';
/**
* Cache-safe switching in case any multi-site hiccups might occur.
*
* Clears the cache after switching to the given blog to avoid using
* another blog's cached values.
*
* Some implementations don't have wp_cache_switch_to_blog() nor the deprecated
* wp_cache_reset(), e.g. WP Engine's object-cache.php which has wp_cache_flush().
*
* @since 2.10.0 giving preference to call wp_cache_init() since it will reset the blog_id
* @since 2.10.0 removed alternative call to wp_cache_reset()
*
* See wp_cache_reset() in wp-includes/cache.php
* @see wp_cache_switch_to_blog()
* @see wp_cache_init()
* @see wp_cache_flush()
* @see wp_cache_reset()
* @link http://core.trac.wordpress.org/ticket/14941
*
* @param int $blog_id
*/
public static function switch_to_blog( $blog_id ) {
switch_to_blog( $blog_id );
if ( function_exists( 'wp_cache_switch_to_blog' ) ) {
wp_cache_switch_to_blog( $blog_id ); // introduced in WP 3.5.0
} else if ( function_exists( 'wp_cache_init' ) ) {
wp_cache_init();
} else if ( function_exists( 'wp_cache_flush' ) ) {
wp_cache_flush();
}
}
/**
* Switch back to previous blog.
*/
public static function restore_current_blog() {
restore_current_blog();
}
/**
* Boot the plugin.
*
* @see Groups_Registered::wpmu_new_blog()
*/
public static function boot() {
register_activation_hook( GROUPS_FILE, array( __CLASS__, 'activate' ) );
register_deactivation_hook( GROUPS_FILE, array( __CLASS__, 'deactivate' ) );
add_action( 'init', array( __CLASS__, 'init' ) );
add_filter( 'load_textdomain_mofile', array( __CLASS__, 'load_textdomain_mofile' ), 10, 2 );
// priority 9 because it needs to be called before Groups_Registered's
// wpmu_new_blog kicks in
add_action( 'wpmu_new_blog', array( __CLASS__, 'wpmu_new_blog' ), 9, 2 );
add_action( 'delete_blog', array( __CLASS__, 'delete_blog' ), 10, 2 );
add_action( 'wp_loaded', array( __CLASS__, 'wp_loaded' ) ); // @since 2.16.0
add_action( 'admin_enqueue_scripts', array( __CLASS__, 'admin_enqueue_scripts' ) ); // @since 2.16.0
}
/**
* Run activation for a newly created blog in a multisite environment.
*
* @param int $blog_id
*/
public static function wpmu_new_blog( $blog_id, $user_id ) {
if ( is_multisite() ) {
$active_sitewide_plugins = get_site_option( 'active_sitewide_plugins', array() );
if ( key_exists( 'groups/groups.php', $active_sitewide_plugins ) ) {
self::switch_to_blog( $blog_id );
self::setup();
self::restore_current_blog();
}
}
}
/**
* Run deactivation for a blog that is about to be deleted in a multisite
* environment.
*
* @param int $blog_id
*/
public static function delete_blog( $blog_id, $drop = false ) {
if ( is_multisite() ) {
$active_sitewide_plugins = get_site_option( 'active_sitewide_plugins', array() );
if ( key_exists( 'groups/groups.php', $active_sitewide_plugins ) ) {
self::switch_to_blog( $blog_id );
self::cleanup( $drop );
self::restore_current_blog();
}
}
}
/**
* Initialize.
* Loads the plugin's translations.
* Invokes version check.
*/
public static function init() {
unload_textdomain( 'groups' );
// Load our current translations first ...
$mofile = self::get_mofile();
load_textdomain( 'groups', $mofile );
// ... otherwise load_plugin_textdomain will simply get those in WP's languages
// and we won't have our up-to-date translations.
//load_plugin_textdomain( 'groups', null, 'groups/languages' );
self::version_check();
// load the notice class
if ( is_admin() ) {
if ( Groups_User::current_user_can( 'activate_plugins' ) ) { // important: after init hook
require_once GROUPS_ADMIN_LIB . '/class-groups-admin-notice.php';
}
}
}
/**
* Register the menu style.
*
* @since 2.16.0
*/
public static function wp_loaded() {
global $groups_version;
if ( !wp_style_is( 'groups-menu', 'registered' ) ) {
wp_register_style( 'groups-menu', GROUPS_PLUGIN_URL . 'css/groups-menu.css', array(), $groups_version );
}
}
/**
* Enqueue the menu style.
*
* @since 2.16.0
*/
public static function admin_enqueue_scripts() {
wp_enqueue_style( 'groups-menu' );
}
/**
* Builds the mofile string for our own translations.
*
* @return string mofile
*/
private static function get_mofile() {
$locale = get_locale();
if ( function_exists( 'get_user_locale' ) ) {
$locale = get_user_locale();
}
$locale = apply_filters( 'plugin_locale', $locale, 'groups' );
$mofile = GROUPS_CORE_DIR . '/languages/groups-' . $locale . '.mo';
// @since 3.3.0 load language-generic translation if available
if ( !file_exists( $mofile ) ) {
$parts = explode( '_', $locale );
$language = $parts[0];
$country = isset( $parts[1] ) ? $parts[1] : '';
$form = isset( $parts[2] ) ? $parts[2] : '';
switch ( $country ) {
case 'CH':
switch ( $form ) {
case 'informal':
$form = '';
break;
case '':
$form = 'formal';
break;
}
break;
}
$the_mofile = null;
if ( $form !== '' ) {
$the_mofile = GROUPS_CORE_DIR . '/languages/groups' . '-' . $language . '_' . $form . '.mo';
if ( !file_exists( $the_mofile ) ) {
$the_mofile = null;
}
}
if ( $the_mofile === null ) {
$the_mofile = GROUPS_CORE_DIR . '/languages/groups' . '-' . $language . '.mo';
if ( !file_exists( $the_mofile ) ) {
$the_mofile = null;
}
}
if ( $the_mofile !== null ) {
$mofile = $the_mofile;
}
}
return $mofile;
}
/**
* Makes sure that our own translation file is loaded first.
*
* @param string $mofile
* @param string $domain
*
* @return string mofile
*/
public static function load_textdomain_mofile( $mofile, $domain ) {
$own_mofile = self::get_mofile();
if ( $domain == 'groups' ) {
if ( $own_mofile != $mofile ) {
if ( !is_textdomain_loaded( $domain ) ) {
if ( is_readable( $own_mofile ) ) {
$mofile = $own_mofile;
}
}
}
}
return $mofile;
}
/**
* Plugin activation.
*
* @param boolean $network_wide
*/
public static function activate( $network_wide = false ) {
$sem_id = self::sem_get( self::get_sem_key() );
if ( ( $sem_id === false ) || self::sem_acquire( $sem_id ) ) {
if ( is_multisite() && $network_wide ) {
$blog_ids = Groups_Utility::get_blogs();
foreach ( $blog_ids as $blog_id ) {
self::switch_to_blog( $blog_id );
self::setup();
self::restore_current_blog();
}
} else {
self::setup();
// @since 3.3.1 Check here already if it is a single activation of Groups and only then set the transient
if ( self::is_single_activate() ) {
set_transient( 'groups_plugin_activated', true, 60 );
}
}
if ( $sem_id !== false ) {
self::sem_release( $sem_id );
self::sem_remove( $sem_id );
}
}
}
/**
* Plugin activation work.
*/
private static function setup() {
global $wpdb, $wp_roles;
// create WP capabilities
Groups_Controller::set_default_capabilities();
$charset_collate = '';
if ( ! empty( $wpdb->charset ) ) {
$charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
}
if ( ! empty( $wpdb->collate ) ) {
$charset_collate .= " COLLATE $wpdb->collate";
}
// create tables
$group_table = _groups_get_tablename( 'group' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$group_table'" ) != $group_table ) {
$queries[] = "CREATE TABLE IF NOT EXISTS $group_table (
group_id BIGINT(20) UNSIGNED NOT NULL auto_increment,
parent_id BIGINT(20) DEFAULT NULL,
creator_id BIGINT(20) DEFAULT NULL,
datetime DATETIME DEFAULT NULL,
name VARCHAR(100) NOT NULL,
description LONGTEXT DEFAULT NULL,
PRIMARY KEY (group_id),
UNIQUE INDEX group_n (name)
) $charset_collate;";
}
$capability_table = _groups_get_tablename( 'capability' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$capability_table'" ) != $capability_table ) {
$queries[] = "CREATE TABLE IF NOT EXISTS $capability_table (
capability_id BIGINT(20) UNSIGNED NOT NULL auto_increment,
capability VARCHAR(255) NOT NULL,
class VARCHAR(255) DEFAULT NULL,
object VARCHAR(255) DEFAULT NULL,
name VARCHAR(100) DEFAULT NULL,
description LONGTEXT DEFAULT NULL,
PRIMARY KEY (capability_id),
UNIQUE INDEX capability (capability(100)),
INDEX capability_kco (capability(20),class(20),object(20))
) $charset_collate;";
}
$user_group_table = _groups_get_tablename( 'user_group' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$user_group_table'" ) != $user_group_table ) {
$queries[] = "CREATE TABLE IF NOT EXISTS $user_group_table (
user_id bigint(20) unsigned NOT NULL,
group_id bigint(20) unsigned NOT NULL,
PRIMARY KEY (user_id, group_id),
INDEX user_group_gu (group_id,user_id)
) $charset_collate;";
}
$user_capability_table = _groups_get_tablename( 'user_capability' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$user_capability_table'" ) != $user_capability_table ) {
$queries[] = "CREATE TABLE IF NOT EXISTS $user_capability_table (
user_id bigint(20) unsigned NOT NULL,
capability_id bigint(20) unsigned NOT NULL,
PRIMARY KEY (user_id, capability_id),
INDEX user_capability_cu (capability_id,user_id)
) $charset_collate;";
}
$group_capability_table = _groups_get_tablename( 'group_capability' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$group_capability_table'" ) != $group_capability_table ) {
$queries[] = "CREATE TABLE IF NOT EXISTS $group_capability_table (
group_id bigint(20) unsigned NOT NULL,
capability_id bigint(20) unsigned NOT NULL,
PRIMARY KEY (group_id, capability_id),
INDEX group_capability_cg (capability_id,group_id)
) $charset_collate;";
}
if ( !empty( $queries ) ) {
// For the record ... (and https://core.trac.wordpress.org/ticket/12773 should not be closed)
// dbDelta() fails to handle queries "CREATE TABLE IF NOT EXISTS ..."
// (a regex results in "IF" used as array index holding only last query to create table).
//require_once ABSPATH . 'wp-admin/includes/upgrade.php';
//dbDelta( $queries );
foreach( $queries as $query ) {
$wpdb->query( $query ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
}
}
// needs to be called to create its capabilities
Groups_Post_Access::activate();
// same thing to created groups for registered users
Groups_Registered::activate();
// add WordPress capabilities
Groups_WordPress::activate();
// ... end of plugin activation work.
}
/**
* Checks current version and triggers update if needed.
*/
public static function version_check() {
global $groups_version, $groups_admin_messages;
$previous_version = get_option( 'groups_plugin_version', '' );
$groups_version = GROUPS_CORE_VERSION;
// auto-enable legacy support on upgrade from Groups previous to 2.0.0
if ( $previous_version ) {
if ( version_compare( $previous_version, self::GROUPS_200 ) < 0 ) {
if ( Groups_Options::get_option( GROUPS_LEGACY_ENABLE ) === null ) {
Groups_Options::update_option( GROUPS_LEGACY_ENABLE, true );
}
set_transient( 'groups_plugin_updated_legacy', true, 60 );
}
}
// disable legacy support on new installations
if ( Groups_Options::get_option( GROUPS_LEGACY_ENABLE ) === null ) {
Groups_Options::update_option( GROUPS_LEGACY_ENABLE, false );
}
// run update procedure if newer version is installed
if ( $previous_version ) {
if ( version_compare( $previous_version, $groups_version ) < 0 ) {
if ( self::update( $previous_version ) ) {
if ( update_option( 'groups_plugin_version', $groups_version ) ) {
set_transient( 'groups_plugin_updated', true, 60 );
}
} else {
$groups_admin_messages[] = '<div class="error">Updating Groups plugin core <em>failed</em>.</div>';
}
}
}
}
/**
* Update maintenance.
*/
public static function update( $previous_version ) {
global $wpdb, $groups_admin_messages;
$result = true;
$sem_id = self::sem_get( self::get_sem_key() );
if ( ( $sem_id === false ) || self::sem_acquire( $sem_id ) ) {
$queries = array();
switch ( $previous_version ) {
case '1.0.0' :
$capability_table = _groups_get_tablename( 'capability' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$capability_table'" ) == $capability_table ) {
// increase column sizes
$queries[] = "ALTER TABLE $capability_table MODIFY capability VARCHAR(255) UNIQUE NOT NULL;";
$queries[] = "ALTER TABLE $capability_table MODIFY class VARCHAR(255) DEFAULT NULL;";
$queries[] = "ALTER TABLE $capability_table MODIFY object VARCHAR(255) DEFAULT NULL;";
// correct capabilities
$queries[] = "UPDATE $capability_table SET capability='delete_published_pages' WHERE capability='delete_published_pag';";
$queries[] = "UPDATE $capability_table SET capability='delete_published_posts' WHERE capability='delete_published_pos';";
// fix hideously big index
$queries[] = "ALTER TABLE $capability_table DROP INDEX capability_kco;";
$queries[] = "ALTER TABLE $capability_table ADD INDEX capability_kco (capability(20),class(20),object(20));";
}
break;
case '1.0.0-beta-3d' :
$capability_table = _groups_get_tablename( 'capability' );
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
if ( $wpdb->get_var( "SHOW TABLES LIKE '$capability_table'" ) == $capability_table ) {
// increase column sizes
$queries[] = "ALTER TABLE $capability_table MODIFY capability VARCHAR(255) UNIQUE NOT NULL;";
$queries[] = "ALTER TABLE $capability_table MODIFY class VARCHAR(255) DEFAULT NULL;";
$queries[] = "ALTER TABLE $capability_table MODIFY object VARCHAR(255) DEFAULT NULL;";
// correct capabilities
$queries[] = "UPDATE $capability_table SET capability='delete_published_pages' WHERE capability='delete_published_pag';";
$queries[] = "UPDATE $capability_table SET capability='delete_published_posts' WHERE capability='delete_published_pos';";
}
break;
default :
if ( !empty( $previous_version ) ) {
if ( version_compare( $previous_version, '1.1.6' ) < 0 ) {
Groups_Options::update_option( Groups_Post_Access::READ_POST_CAPABILITIES, array( Groups_Post_Access::READ_POST_CAPABILITY ) );
$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->postmeta SET meta_value = %s WHERE meta_key = %s", Groups_Post_Access::READ_POST_CAPABILITY, Groups_Post_Access::POSTMETA_PREFIX . Groups_Post_Access::READ_POST_CAPABILITY ) );
}
if ( version_compare( $previous_version, '1.5.1' ) < 0 ) {
$capability_table = _groups_get_tablename( 'capability' );
$queries[] = "ALTER TABLE $capability_table DROP INDEX capability, ADD UNIQUE INDEX capability(capability(100));";
}
}
} // switch
if ( !empty( $previous_version ) && version_compare( $previous_version, '2.0.0' ) < 0 ) {
self::set_default_capabilities();
Groups_WordPress::refresh_capabilities();
}
foreach ( $queries as $query ) {
if ( $wpdb->query( $query ) === false ) { // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$result = false;
}
}
}
return $result;
}
/**
* Drop tables and clear data if the plugin is deactivated.
* This will happen only if the user chooses to delete data upon deactivation.
*
* @param boolean $network_wide
*/
public static function deactivate( $network_wide = false ) {
$sem_id = self::sem_get( self::get_sem_key() );
if ( ( $sem_id === false ) || self::sem_acquire( $sem_id ) ) {
if ( is_multisite() && $network_wide ) {
if ( Groups_Options::get_option( 'groups_network_delete_data', false ) ) {
$blog_ids = Groups_Utility::get_blogs();
foreach ( $blog_ids as $blog_id ) {
self::switch_to_blog( $blog_id );
self::cleanup( true );
self::restore_current_blog();
}
}
} else {
self::cleanup();
}
if ( $sem_id !== false ) {
self::sem_release( $sem_id );
self::sem_remove( $sem_id );
}
}
}
/**
* Plugin deactivation cleanup.
*
* @param $drop boolean overrides the groups_delete_data option, default is false
*/
private static function cleanup( $drop = false ) {
global $wpdb, $wp_roles;
$delete_data = Groups_Options::get_option( 'groups_delete_data', false );
if ( $delete_data || $drop ) {
foreach ( $wp_roles->role_objects as $role ) {
$role->remove_cap( GROUPS_ACCESS_GROUPS );
$role->remove_cap( GROUPS_ADMINISTER_GROUPS );
$role->remove_cap( GROUPS_ADMINISTER_OPTIONS );
$role->remove_cap( GROUPS_RESTRICT_ACCESS );
}
$wpdb->query( 'DROP TABLE IF EXISTS ' . _groups_get_tablename( 'group' ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$wpdb->query( 'DROP TABLE IF EXISTS ' . _groups_get_tablename( 'capability' ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$wpdb->query( 'DROP TABLE IF EXISTS ' . _groups_get_tablename( 'user_group' ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$wpdb->query( 'DROP TABLE IF EXISTS ' . _groups_get_tablename( 'user_capability' ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$wpdb->query( 'DROP TABLE IF EXISTS ' . _groups_get_tablename( 'group_capability' ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
Groups_Options::flush_options();
if ( class_exists( 'Groups_Admin_Notice' ) ) {
delete_metadata( 'user', null, Groups_Admin_Notice::HIDE_REVIEW_NOTICE, null, true );
delete_site_option( Groups_Admin_Notice::INIT_TIME );
}
delete_option( GROUPS_ADMINISTRATOR_ACCESS_OVERRIDE ); // keep this to delete the deprecated option @since 2.1.1
delete_option( 'groups_plugin_version' );
delete_option( 'groups_delete_data' );
}
}
/**
* Whether this is an individual activation of the plugin.
*
* @since 3.3.1
*
* @return boolean
*/
private static function is_single_activate() {
$is = false;
$groups_basename = plugin_basename( GROUPS_FILE );
if ( isset( $_REQUEST['action'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
switch ( $_REQUEST['action'] ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
case 'activate':
// Single plugin activation of Groups:
if ( !empty( $_REQUEST['plugin'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$slug = wp_unslash( $_REQUEST['plugin'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
if ( $slug === $groups_basename ) {
$is = true;
}
}
break;
case 'activate-selected':
// Bulk plugin activation of Groups but it is the only plugin being activated:
if ( !empty( $_REQUEST['checked'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
if ( is_array( $_REQUEST['checked'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
if ( count( $_REQUEST['checked'] ) === 1 ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$slugs = wp_unslash( $_REQUEST['checked'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$slug = array_pop( $slugs );
if ( $slug === $groups_basename ) {
$is = true;
break;
}
}
}
}
break;
}
}
return $is;
}
/**
* Determines the default capabilities for the administrator role.
* In lack of an administrator role, these capabilities are assigned
* to any role that can manage_options.
* This is also used to assure a minimum set of capabilities is
* assigned to an appropriate role, so that it's not possible
* to lock yourself out (although deactivating and then activating
* the plugin would have the same effect but with the danger of
* deleting all plugin data).
*
* @param boolean $activate defaults to true, when this function is called upon plugin activation
*
* @access private
*/
public static function set_default_capabilities() {
global $wp_roles;
// The administrator role should be there, if it's not, assign privileges to
// any role that can manage_options:
if ( $administrator_role = $wp_roles->get_role( 'administrator' ) ) {
$administrator_role->add_cap( GROUPS_ACCESS_GROUPS );
$administrator_role->add_cap( GROUPS_ADMINISTER_GROUPS );
$administrator_role->add_cap( GROUPS_ADMINISTER_OPTIONS );
$administrator_role->add_cap( GROUPS_RESTRICT_ACCESS );
} else {
foreach ( $wp_roles->role_objects as $role ) {
if ($role->has_cap( 'manage_options' ) ) {
$role->add_cap( GROUPS_ACCESS_GROUPS );
$role->add_cap( GROUPS_ADMINISTER_GROUPS );
$role->add_cap( GROUPS_ADMINISTER_OPTIONS );
$role->add_cap( GROUPS_RESTRICT_ACCESS );
}
}
}
}
/**
* There must be at least one role with the minimum set of capabilities
* to access and manage the Groups plugin's options.
* If this condition is not met, the minimum set of capabilities is
* reestablished.
*/
public static function assure_capabilities() {
global $wp_roles;
$complies = false;
$roles = $wp_roles->role_objects;
foreach( $roles as $role ) {
if ( $role->has_cap( GROUPS_ACCESS_GROUPS ) && ( $role->has_cap( GROUPS_ADMINISTER_OPTIONS ) ) ) {
$complies = true;
break;
}
}
if ( !$complies ) {
self::set_default_capabilities();
}
}
/**
* Guarded sem_get() wrapper.
*
* @see sem_get()
*
* @param int $key
* @param number $max_acquire
* @param number $perm
* @param number $auto_release
*
* @return boolean|resource
*/
private static function sem_get( $key, $max_acquire = 1, $perm = 0666, $auto_release = 1 ) {
$result = false;
if ( function_exists( 'sem_get' ) ) {
$result = sem_get( $key, $max_acquire, $perm, $auto_release );
}
return $result;
}
/**
* Guarded sem_acquire() wrapper.
*
* To maintain backwards-compatibility with servers running PHP < 5.6 where
* the second parameter to sem_acquire() is not supported, we use sem_remove()
* and have any calls waiting on sem_acquire() fail silently (achieving that
* the activation, update or deactivation routines are not run for those
* processes that have been waiting and which would have duplicated execution
* unnecessarily).
*
* @see sem_acquire()
*
* @param resource $sem_identifier
* @param string $nowait (only taken into account and effective on PHP >= 5.6.1)
*
* @return boolean
*/
private static function sem_acquire( $sem_identifier, $nowait = false ) {
$result = false;
if ( function_exists( 'sem_acquire' ) ) {
if ( version_compare( phpversion(), '5.6.1' ) >= 0 ) {
$result = @sem_acquire( $sem_identifier, $nowait );
} else {
$result = @sem_acquire( $sem_identifier );
}
}
return $result;
}
/**
* Guarded sem_release() wrapper.
*
* @see sem_release()
*
* @param resource $sem_identifier
*
* @return boolean
*/
private static function sem_release( $sem_identifier ) {
$result = false;
if ( function_exists( 'sem_release' ) ) {
$result = @sem_release( $sem_identifier );
}
return $result;
}
/**
* Guarded sem_remove() wrapper.
*
* @see sem_remove()
*
* @param resource $sem_identifier
*
* @return boolean
*/
private static function sem_remove( $sem_identifier ) {
$result = false;
if ( function_exists( 'sem_remove' ) ) {
$result = @sem_remove( $sem_identifier );
}
return $result;
}
/**
* Produces a file-based key for use with sem_get().
*
* @return number
*/
private static function get_sem_key() {
$key = -1;
if ( function_exists( 'ftok' ) ) {
$key = ftok( __FILE__, 'g' );
}
if ( $key == -1 ) {
$key = fileinode( __FILE__ );
}
return $key;
}
}
Groups_Controller::boot();