www.gusucode.com > wordpress PHP博客系统英文版 v4.5.1PHP源码程序 > wordpress PHP博客系统英文版 v4.5.1/wordpress/wordpress/wp-includes/class-wp-roles.php
<?php
/**
* User API: WP_Roles class
*
* @package WordPress
* @subpackage Users
* @since 4.4.0
*/
/**
* Core class used to implement a user roles API.
*
* The role option is simple, the structure is organized by role name that store
* the name in value of the 'name' key. The capabilities are stored as an array
* in the value of the 'capability' key.
*
* array (
* 'rolename' => array (
* 'name' => 'rolename',
* 'capabilities' => array()
* )
* )
*
* @since 2.0.0
*/
class WP_Roles {
/**
* List of roles and capabilities.
*
* @since 2.0.0
* @access public
* @var array
*/
public $roles;
/**
* List of the role objects.
*
* @since 2.0.0
* @access public
* @var array
*/
public $role_objects = array();
/**
* List of role names.
*
* @since 2.0.0
* @access public
* @var array
*/
public $role_names = array();
/**
* Option name for storing role list.
*
* @since 2.0.0
* @access public
* @var string
*/
public $role_key;
/**
* Whether to use the database for retrieval and storage.
*
* @since 2.1.0
* @access public
* @var bool
*/
public $use_db = true;
/**
* Constructor
*
* @since 2.0.0
*/
public function __construct() {
$this->_init();
}
/**
* Make private/protected methods readable for backwards compatibility.
*
* @since 4.0.0
* @access public
*
* @param callable $name Method to call.
* @param array $arguments Arguments to pass when calling.
* @return mixed|false Return value of the callback, false otherwise.
*/
public function __call( $name, $arguments ) {
if ( '_init' === $name ) {
return call_user_func_array( array( $this, $name ), $arguments );
}
return false;
}
/**
* Set up the object properties.
*
* The role key is set to the current prefix for the $wpdb object with
* 'user_roles' appended. If the $wp_user_roles global is set, then it will
* be used and the role option will not be updated or used.
*
* @since 2.1.0
* @access protected
*
* @global wpdb $wpdb WordPress database abstraction object.
* @global array $wp_user_roles Used to set the 'roles' property value.
*/
protected function _init() {
global $wpdb, $wp_user_roles;
$this->role_key = $wpdb->get_blog_prefix() . 'user_roles';
if ( ! empty( $wp_user_roles ) ) {
$this->roles = $wp_user_roles;
$this->use_db = false;
} else {
$this->roles = get_option( $this->role_key );
}
if ( empty( $this->roles ) )
return;
$this->role_objects = array();
$this->role_names = array();
foreach ( array_keys( $this->roles ) as $role ) {
$this->role_objects[$role] = new WP_Role( $role, $this->roles[$role]['capabilities'] );
$this->role_names[$role] = $this->roles[$role]['name'];
}
}
/**
* Reinitialize the object
*
* Recreates the role objects. This is typically called only by switch_to_blog()
* after switching wpdb to a new site ID.
*
* @since 3.5.0
* @access public
*
* @global wpdb $wpdb WordPress database abstraction object.
*/
public function reinit() {
// There is no need to reinit if using the wp_user_roles global.
if ( ! $this->use_db )
return;
global $wpdb;
// Duplicated from _init() to avoid an extra function call.
$this->role_key = $wpdb->get_blog_prefix() . 'user_roles';
$this->roles = get_option( $this->role_key );
if ( empty( $this->roles ) )
return;
$this->role_objects = array();
$this->role_names = array();
foreach ( array_keys( $this->roles ) as $role ) {
$this->role_objects[$role] = new WP_Role( $role, $this->roles[$role]['capabilities'] );
$this->role_names[$role] = $this->roles[$role]['name'];
}
}
/**
* Add role name with capabilities to list.
*
* Updates the list of roles, if the role doesn't already exist.
*
* The capabilities are defined in the following format `array( 'read' => true );`
* To explicitly deny a role a capability you set the value for that capability to false.
*
* @since 2.0.0
* @access public
*
* @param string $role Role name.
* @param string $display_name Role display name.
* @param array $capabilities List of role capabilities in the above format.
* @return WP_Role|void WP_Role object, if role is added.
*/
public function add_role( $role, $display_name, $capabilities = array() ) {
if ( empty( $role ) || isset( $this->roles[ $role ] ) ) {
return;
}
$this->roles[$role] = array(
'name' => $display_name,
'capabilities' => $capabilities
);
if ( $this->use_db )
update_option( $this->role_key, $this->roles );
$this->role_objects[$role] = new WP_Role( $role, $capabilities );
$this->role_names[$role] = $display_name;
return $this->role_objects[$role];
}
/**
* Remove role by name.
*
* @since 2.0.0
* @access public
*
* @param string $role Role name.
*/
public function remove_role( $role ) {
if ( ! isset( $this->role_objects[$role] ) )
return;
unset( $this->role_objects[$role] );
unset( $this->role_names[$role] );
unset( $this->roles[$role] );
if ( $this->use_db )
update_option( $this->role_key, $this->roles );
if ( get_option( 'default_role' ) == $role )
update_option( 'default_role', 'subscriber' );
}
/**
* Add capability to role.
*
* @since 2.0.0
* @access public
*
* @param string $role Role name.
* @param string $cap Capability name.
* @param bool $grant Optional, default is true. Whether role is capable of performing capability.
*/
public function add_cap( $role, $cap, $grant = true ) {
if ( ! isset( $this->roles[$role] ) )
return;
$this->roles[$role]['capabilities'][$cap] = $grant;
if ( $this->use_db )
update_option( $this->role_key, $this->roles );
}
/**
* Remove capability from role.
*
* @since 2.0.0
* @access public
*
* @param string $role Role name.
* @param string $cap Capability name.
*/
public function remove_cap( $role, $cap ) {
if ( ! isset( $this->roles[$role] ) )
return;
unset( $this->roles[$role]['capabilities'][$cap] );
if ( $this->use_db )
update_option( $this->role_key, $this->roles );
}
/**
* Retrieve role object by name.
*
* @since 2.0.0
* @access public
*
* @param string $role Role name.
* @return WP_Role|null WP_Role object if found, null if the role does not exist.
*/
public function get_role( $role ) {
if ( isset( $this->role_objects[$role] ) )
return $this->role_objects[$role];
else
return null;
}
/**
* Retrieve list of role names.
*
* @since 2.0.0
* @access public
*
* @return array List of role names.
*/
public function get_names() {
return $this->role_names;
}
/**
* Whether role name is currently in the list of available roles.
*
* @since 2.0.0
* @access public
*
* @param string $role Role name to look up.
* @return bool
*/
public function is_role( $role ) {
return isset( $this->role_names[$role] );
}
}