function hook_module_implements_alter in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Extension/module.api.php \hook_module_implements_alter()
2. 7 modules/system/system.api.php \hook_module_implements_alter()

Alter the registry of modules implementing a hook.

This hook is invoked during \Drupal::moduleHandler()->getImplementations(). A module may implement this hook in order to reorder the implementing modules, which are otherwise ordered by the module's system weight.

Note that hooks invoked using \Drupal::moduleHandler->alter() can have multiple variations(such as hook_form_alter() and hook_form_FORM_ID_alter()). \Drupal::moduleHandler->alter() will call all such variants defined by a single module in turn. For the purposes of hook_module_implements_alter(), these variants are treated as a single hook. Thus, to ensure that your implementation of hook_form_FORM_ID_alter() is called at the right time, you will have to change the order of hook_form_alter() implementation in hook_module_implements_alter().

Parameters

$implementations: An array keyed by the module's name. The value of each item corresponds to a $group, which is usually FALSE, unless the implementation is in a file named $module.$group.inc.

$hook: The name of the module hook being implemented.

Related topics

6 functions implement hook_module_implements_alter()

Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

common_test_module_implements_alter in core/modules/system/tests/modules/common_test/common_test.module

Implements hook_module_implements_alter().

content_translation_module_implements_alter in core/modules/content_translation/content_translation.module

Implements hook_module_implements_alter().

layout_builder_module_implements_alter in core/modules/layout_builder/layout_builder.module

Implements hook_module_implements_alter().

layout_builder_test_module_implements_alter in core/modules/layout_builder/tests/modules/layout_builder_test/layout_builder_test.module

Implements hook_module_implements_alter().

module_test_module_implements_alter in core/modules/system/tests/modules/module_test/module_test.module

Implements hook_module_implements_alter().

... See full list

3 invocations of hook_module_implements_alter()

ModuleHandler::alter in core/lib/Drupal/Core/Extension/ModuleHandler.php

Passes alterable variables to specific hook_TYPE_alter() implementations.

ModuleHandler::buildImplementationInfo in core/lib/Drupal/Core/Extension/ModuleHandler.php

Builds hook implementation information for a given hook name.

ModuleImplementsAlterTest::testModuleImplementsAlter in core/tests/Drupal/KernelTests/Core/Extension/ModuleImplementsAlterTest.php

Tests hook_module_implements_alter() adding an implementation.

File

core/lib/Drupal/Core/Extension/module.api.php, line 117

Hooks related to module and update systems.

Code

function hook_module_implements_alter(&$implementations, $hook) {
  if ($hook == 'form_alter') {

    // Move my_module_form_alter() to the end of the list.
    // \Drupal::moduleHandler()->getImplementations()
    // iterates through $implementations with a foreach loop which PHP iterates
    // in the order that the items were added, so to move an item to the end of
    // the array, we remove it and then add it.
    $group = $implementations['my_module'];
    unset($implementations['my_module']);
    $implementations['my_module'] = $group;
  }
}