Issue #309040: Introducing hook_requirements_alter()

Closes #309040

core/lib/Drupal/Core/Extension/module.api.php

@@ -1022,6 +1022,29 @@ function hook_requirements($phase) {
   return $requirements;
 }
 
+/**
+ * Alters requirements data.
+ *
+ * Implementations are able to alter the title, value, description or the
+ * severity of certain requirements defined by hook_requirements()
+ * implementations or even remove such entries.
+ *
+ * @param array $requirements
+ *   The requirements data to be altered.
+ *
+ * @see hook_requirements()
+ */
+function hook_requirements_alter(array &$requirements): void {
+  // Change the title from 'PHP' to 'PHP version'.
+  $requirements['php']['title'] = t('PHP version');
+
+  // Decrease the 'update status' requirement severity from warning to warning.
+  $requirements['update status']['severity'] = REQUIREMENT_INFO;
+
+  // Remove a requirements entry.
+  unset($requirements['foo']);
+}
+
 /**
  * @} End of "addtogroup hooks".
  */