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-rw-r--r--engine/start.php65
1 files changed, 51 insertions, 14 deletions
diff --git a/engine/start.php b/engine/start.php
index 1acbef977..d9ec01b87 100644
--- a/engine/start.php
+++ b/engine/start.php
@@ -1,22 +1,50 @@
<?php
/**
- * Elgg engine bootstrapper
- * Loads the various elements of the Elgg engine
+ * Bootstraps and starts the Elgg engine.
*
- * @package Elgg
+ * This file loads the full Elgg engine, checks the installation
+ * state, then emits a series of events to finish booting Elgg:
+ * - {@elgg_event boot system}
+ * - {@elgg_event plugins_boot system}
+ * - {@elgg_event init system}
+ *
+ * If Elgg is uninstalled, the browser will be redirected to an
+ * installation page.
+ *
+ * If in an installation, attempts to save the .htaccess and
+ * settings.php files during {@link sanitised()}
+ *
+ * @warning The view type is set to 'failsafe' during boot. This means calling
+ * {@link elgg_get_viewtype()} will return 'failsafe' in any function called by
+ * the events listed above regardless of actual view. The original view is restored
+ * after booting.
+ *
+ * @see install.php
+ * @package Elgg.Core
* @subpackage Core
- * @author Curverider Ltd
- * @link http://elgg.org/
*/
-/*
- * Basic profiling
+/**
+ * The time with microseconds when the Elgg engine was started.
+ *
+ * @global float
*/
global $START_MICROTIME;
$START_MICROTIME = microtime(true);
-/*
- * Create global CONFIG object
+/**
+ * Configuration values.
+ *
+ * The $CONFIG global contains configuration values required
+ * for running Elgg as defined in the settings.php file. The following
+ * array keys are defined by core Elgg:
+ *
+ * Plugin authors are encouraged to use get_config() instead of accessing the
+ * global directly.
+ *
+ * @see get_config()
+ * @see engine/settings.php
+ * @global stdClass $CONFIG
*/
global $CONFIG;
if (!isset($CONFIG)) {
@@ -25,12 +53,17 @@ if (!isset($CONFIG)) {
$lib_dir = dirname(__FILE__) . '/lib/';
-// bootstrapping with required files in a required order
+/**
+ * The minimum required libs to bootstrap an Elgg installation.
+ *
+ * @var array
+ */
$required_files = array(
'exceptions.php', 'elgglib.php', 'views.php', 'access.php', 'system_log.php', 'export.php',
'sessions.php', 'languages.php', 'input.php', 'install.php', 'cache.php', 'output.php'
);
+// include bootstraping libs
foreach ($required_files as $file) {
$path = $lib_dir . $file;
if (!include($path)) {
@@ -62,7 +95,7 @@ if ($sanitised = sanitised()) {
// load the rest of the library files from engine/lib/
$lib_files = array(
- // these want to be loaded first apparently?
+ // these need to be loaded first.
'database.php', 'actions.php',
'admin.php', 'annotations.php', 'api.php', 'cache.php',
@@ -91,14 +124,17 @@ if ($sanitised = sanitised()) {
// Autodetect some default configuration settings
set_default_config();
-// Trigger events
+// Trigger boot events for core. Plugins can't hook
+// into this because they haven't been loaded yet.
trigger_elgg_event('boot', 'system');
// Check if installed
$installed = is_installed();
$db_installed = is_db_installed();
-// Forward if we haven't been installed
+/**
+ * Forward if Elgg is not installed.
+ */
if ((!$installed || !$db_installed)
&& !substr_count($_SERVER["PHP_SELF"], "install.php")
&& !substr_count($_SERVER["PHP_SELF"], "css.php")
@@ -130,6 +166,7 @@ if (!elgg_is_valid_view_type($oldview)) {
$oldview = $CONFIG->view;
}
}
+
set_input('view', $oldview);
// Regenerate the simple cache if expired.
@@ -142,4 +179,4 @@ if (($installed) && ($db_installed) && !(defined('upgrading') && upgrading == 'u
}
// needs to be set for links in html head
$CONFIG->lastcache = $lastcached;
-}
+} \ No newline at end of file