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<?php
// $Id$
/**
* @file
* API for loading and interacting with Drupal modules.
*/
/**
* Initialize all modules.
*/
function module_init() {
// Load all the modules that have been enabled in the system table.
foreach (module_list(TRUE, FALSE) as $module) {
drupal_load('module', $module);
}
module_invoke_all('init');
}
/**
* Call a function repeatedly with each module in turn as an argument.
*/
function module_iterate($function, $argument = '') {
foreach (module_list() as $name) {
$function($name, $argument);
}
}
/**
* Collect a list of all loaded modules. During the bootstrap, return only
* vital modules. See bootstrap.inc
*
* @param $refresh
* Whether to force the module list to be regenerated (such as after the
* administrator has changed the system settings).
* @param $bootstrap
* Whether to return the reduced set of modules loaded in "bootstrap mode"
* for cached pages. See bootstrap.inc.
* @param $sort
* By default, modules are ordered by weight and filename, settings this option
* to TRUE, module list will be ordered by module name.
* @return
* An associative array whose keys and values are the names of all loaded
* modules.
*/
function module_list($refresh = FALSE, $bootstrap = TRUE, $sort = FALSE) {
static $list, $sorted_list;
if ($refresh) {
$list = array();
$sorted_list = NULL;
}
if (!$list) {
$list = array('filter' => 'filter', 'node' => 'node', 'system' => 'system', 'user' => 'user', 'watchdog' => 'watchdog');
if ($bootstrap) {
$result = db_query("SELECT name, filename, throttle, bootstrap FROM {system} WHERE type = 'module' AND status = 1 AND bootstrap = 1 ORDER BY weight ASC, filename ASC");
}
else {
$result = db_query("SELECT name, filename, throttle, bootstrap FROM {system} WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC");
}
while ($module = db_fetch_object($result)) {
if (file_exists($module->filename)) {
// Determine the current throttle status and see if the module should be
// loaded based on server load. We have to directly access the throttle
// variables, since throttle.module may not be loaded yet.
$throttle = ($module->throttle && variable_get('throttle_level', 0) > 0);
if (!$throttle) {
drupal_get_filename('module', $module->name, $module->filename);
$list[$module->name] = $module->name;
}
}
}
}
if ($sort) {
if (!isset($sorted_list)) {
$sorted_list = $list;
ksort($sorted_list);
}
return $sorted_list;
}
return $list;
}
/**
* Determine whether a given module exists.
*
* @param $module
* The name of the module (without the .module extension).
* @return
* TRUE if the module is both installed and enabled.
*/
function module_exist($module) {
$list = module_list();
return array_key_exists($module, $list);
}
/**
* @defgroup hooks Hooks
* @{
* Allow modules to interact with the Drupal core.
*
* Drupal's module system is based on the concept of "hooks". A hook is a PHP
* function that is named foo_bar(), where "foo" is the name of the module (whose
* filename is thus foo.module) and "bar" is the name of the hook. Each hook has
* a defined set of parameters and a specified result type.
*
* To extend Drupal, a module need simply implement a hook. When Drupal wishes to
* allow intervention from modules, it determines which modules implement a hook
* and call that hook in all enabled modules that implement it.
*
* The available hooks to implement are explained here in the Hooks section of
* the developer documentation. The string "hook" is used as a placeholder for
* the module name is the hook definitions. For example, if the module file is
* called example.module, then hook_help() as implemented by that module would be
* defined as example_help().
*/
/**
* Determine whether a module implements a hook.
*
* @param $module
* The name of the module (without the .module extension).
* @param $hook
* The name of the hook (e.g. "help" or "menu").
* @return
* TRUE if the module is both installed and enabled, and the hook is
* implemented in that module.
*/
function module_hook($module, $hook) {
return function_exists($module .'_'. $hook);
}
/**
* Determine which modules are implementing a hook.
*
* @param $hook
* The name of the hook (e.g. "help" or "menu").
* @param $sort
* By default, modules are ordered by weight and filename, settings this option
* to TRUE, module list will be ordered by module name.
* @return
* An array with the names of the modules which are implementing this hook.
*/
function module_implements($hook, $sort = FALSE) {
static $implementations;
if (!isset($implementations[$hook])) {
$implementations[$hook] = array();
$list = module_list(FALSE, TRUE, $sort);
foreach ($list as $module) {
if (module_hook($module, $hook)) {
$implementations[$hook][] = $module;
}
}
}
// The explicit cast forces a copy to be made. This is needed because
// $implementations[$hook] is only a reference to an element of
// $implementations and if there are nested foreaches (due to nested node
// API calls, for example), they would both manipulate the same array's
// references, which causes some modules' hooks not to be called.
// See also http://www.zend.com/zend/art/ref-count.php.
return (array)$implementations[$hook];
}
/**
* Invoke a hook in a particular module.
*
* @param $module
* The name of the module (without the .module extension).
* @param $hook
* The name of the hook to invoke.
* @param ...
* Arguments to pass to the hook implementation.
* @return
* The return value of the hook implementation.
*/
function module_invoke() {
$args = func_get_args();
$module = array_shift($args);
$hook = array_shift($args);
$function = $module .'_'. $hook;
if (module_hook($module, $hook)) {
return call_user_func_array($function, $args);
}
}
/**
* Invoke a hook in all enabled modules that implement it.
*
* @param $hook
* The name of the hook to invoke.
* @param ...
* Arguments to pass to the hook.
* @return
* An array of return values of the hook implementations. If modules return
* arrays from their implementations, those are merged into one array.
*/
function module_invoke_all() {
$args = func_get_args();
$hook = array_shift($args);
$return = array();
foreach (module_implements($hook) as $module) {
$function = $module .'_'. $hook;
$result = call_user_func_array($function, $args);
if (isset($result) && is_array($result)) {
$return = array_merge($return, $result);
}
else if (isset($result)) {
$return[] = $result;
}
}
return $return;
}
/**
* @} End of "defgroup hooks".
*/
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