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| Title | Object type | File name | Summary | 
|---|---|---|---|
| drupal_get_schema_versions | function | core/ | Returns an array of available schema versions for a module. | 
| drupal_get_updaters | function | core/ | Assembles the Drupal Updater registry. | 
| drupal_get_user_timezone | function | core/ | Returns the time zone of the current user. | 
| drupal_http_header_attributes | function | core/ | Formats an attribute string for an HTTP header. | 
| drupal_installation_attempted | function | core/ | Returns TRUE if a Drupal installation is currently being attempted. | 
| drupal_install_config_directories | function | core/ | Creates the config directory and ensures it is operational. | 
| drupal_install_fix_file | function | core/ | Attempts to fix file permissions. | 
| drupal_install_mkdir | function | core/ | Creates a directory with the specified permissions. | 
| drupal_install_profile_distribution_name | function | core/ | Loads the installation profile, extracting its defined distribution name. | 
| drupal_install_profile_distribution_version | function | core/ | Loads the installation profile, extracting its defined version. | 
| drupal_install_schema | function | core/ | Creates all tables defined in a module's hook_schema(). | 
| drupal_install_system | function | core/ | Installs the system module. | 
| drupal_js_defaults | function | core/ | Constructs an array of the defaults that are used for JavaScript assets. | 
| drupal_load_updates | function | core/ | Loads .install files for installed modules to initialize the update system. | 
| drupal_maintenance_theme | function | core/ | Enables use of the theme system without requiring database access. | 
| drupal_migrate_post_update_clear_migrate_field_plugin_cache | function | core/ | Force MigrateField plugin definitions to be cleared. | 
| DRUPAL_MINIMUM_PHP | constant | core/ | Minimum allowed version of PHP. | 
| DRUPAL_MINIMUM_PHP_MEMORY_LIMIT | constant | core/ | Minimum recommended value of PHP memory_limit. | 
| DRUPAL_MINIMUM_SUPPORTED_PHP | constant | core/ | Minimum supported version of PHP. | 
| drupal_mkdir | function | core/ | Creates a directory, optionally creating missing components in the path to the directory. | 
| drupal_move_uploaded_file | function | core/ | Moves an uploaded file to a new location. | 
| DRUPAL_OPTIONAL | constant | core/ | Optional option on forms and settings | 
| drupal_phpunit_contrib_extension_directory_roots | function | core/ | Returns directories under which contributed extensions may exist. | 
| drupal_phpunit_find_extension_directories | function | core/ | Finds all valid extension directories recursively within a given directory. | 
| drupal_phpunit_get_extension_namespaces | function | core/ | Registers the namespace for each extension directory with the autoloader. | 
| drupal_phpunit_populate_class_loader | function | core/ | Populate class loader with additional namespaces for tests. | 
| DRUPAL_PHP_FUNCTION_PATTERN | constant | core/ | Regular expression to match PHP function names. | 
| drupal_placeholder | function | core/ | Formats text for emphasized display in a placeholder inside a sentence. | 
| drupal_pre_render_link | function | core/ | Pre-render callback: Renders a link into #markup. | 
| drupal_pre_render_links | function | core/ | Pre-render callback: Collects child links into a single array. | 
| drupal_process_states | function | core/ | Adds JavaScript to change the state of an element based on another element. | 
| drupal_realpath | function | core/ | Resolves the absolute filepath of a local URI or filepath. | 
| drupal_rebuild | function | core/ | Rebuilds all caches even when Drupal itself does not work. | 
| DRUPAL_RECOMMENDED_PHP | constant | core/ | Minimum recommended version of PHP. | 
| drupal_register_shutdown_function | function | core/ | Registers a function for execution on shutdown. | 
| drupal_render | function | core/ | Renders HTML given a structured array tree. | 
| drupal_render_children | function | core/ | Renders children of an element and concatenates them. | 
| drupal_render_root | function | core/ | Renders final HTML given a structured array tree. | 
| DRUPAL_REQUIRED | constant | core/ | Required option on forms and settings | 
| drupal_required_modules | function | core/ | Returns an array of modules required by core. | 
| drupal_requirements_severity | function | core/ | Extracts the highest severity from the requirements array. | 
| drupal_requirements_url | function | core/ | Returns a URL for proceeding to the next page after a requirements problem. | 
| drupal_rewrite_settings | function | core/ | Replaces values in settings.php with values in the submitted array. | 
| drupal_rmdir | function | core/ | Removes a directory. | 
| DRUPAL_ROOT | constant | core/ | Defines the root directory of the Drupal installation. | 
| drupal_schema_get_field_value | function | core/ | Typecasts values to proper data types. | 
| drupal_set_installed_schema_version | function | core/ | Updates the installed version information for a module. | 
| drupal_set_message | function | core/ | Sets a message to display to the user. | 
| drupal_set_time_limit | function | core/ | Attempts to set the PHP maximum execution time. | 
| drupal_static | function | core/ | Provides central static variable storage. | 
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