wordpress学习第七篇（default-constants.php）

<?php/** * Defines constants and global variables that can be overridden, generally in wp-config.php. * * @package WordPress *//** * Defines initial WordPress constants * * @see wp_debug_mode() * * @since 3.0.0 */function wp_initial_constants( ) {global $blog_id;// set memory limitsif ( !defined('WP_MEMORY_LIMIT') ) {if( is_multisite() ) {define('WP_MEMORY_LIMIT', '64M');} else {define('WP_MEMORY_LIMIT', '32M');}}if ( ! defined( 'WP_MAX_MEMORY_LIMIT' ) ) {define( 'WP_MAX_MEMORY_LIMIT', '256M' );}/** * The $blog_id global, which you can change in the config allows you to create a simple * multiple blog installation using just one WordPress and changing $blog_id around. * * @global int $blog_id * @since 2.0.0 */if ( ! isset($blog_id) )$blog_id = 1;// set memory limits.if ( function_exists('memory_get_usage') && ( (int) @ini_get('memory_limit') < abs(intval(WP_MEMORY_LIMIT)) ) )@ini_set('memory_limit', WP_MEMORY_LIMIT);if ( !defined('WP_CONTENT_DIR') )define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' ); // no trailing slash, full paths only - WP_CONTENT_URL is defined further down// Add define('WP_DEBUG', true); to wp-config.php to enable display of notices during development.if ( !defined('WP_DEBUG') )define( 'WP_DEBUG', false );// Add define('WP_DEBUG_DISPLAY', false); to wp-config.php use the globally configured setting for display_errors and not force errors to be displayed.if ( !defined('WP_DEBUG_DISPLAY') )define( 'WP_DEBUG_DISPLAY', true );// Add define('WP_DEBUG_LOG', true); to enable error logging to wp-content/debug.log.if ( !defined('WP_DEBUG_LOG') )define('WP_DEBUG_LOG', false);if ( !defined('WP_CACHE') )define('WP_CACHE', false);/** * Private */if ( !defined('MEDIA_TRASH') )define('MEDIA_TRASH', false);if ( !defined('SHORTINIT') )define('SHORTINIT', false);}/** * Defines plugin directory WordPress constants * * Defines must-use plugin directory constants, which may be overridden in the sunrise.php drop-in * * @since 3.0.0 */function wp_plugin_directory_constants( ) {if ( !defined('WP_CONTENT_URL') )define( 'WP_CONTENT_URL', get_option('siteurl') . '/wp-content'); // full url - WP_CONTENT_DIR is defined further up/** * Allows for the plugins directory to be moved from the default location. * * @since 2.6.0 */if ( !defined('WP_PLUGIN_DIR') )define( 'WP_PLUGIN_DIR', WP_CONTENT_DIR . '/plugins' ); // full path, no trailing slash/** * Allows for the plugins directory to be moved from the default location. * * @since 2.6.0 */if ( !defined('WP_PLUGIN_URL') )define( 'WP_PLUGIN_URL', WP_CONTENT_URL . '/plugins' ); // full url, no trailing slash/** * Allows for the plugins directory to be moved from the default location. * * @since 2.1.0 * @deprecated */if ( !defined('PLUGINDIR') )define( 'PLUGINDIR', 'wp-content/plugins' ); // Relative to ABSPATH.  For back compat./** * Allows for the mu-plugins directory to be moved from the default location. * * @since 2.8.0 */if ( !defined('WPMU_PLUGIN_DIR') )define( 'WPMU_PLUGIN_DIR', WP_CONTENT_DIR . '/mu-plugins' ); // full path, no trailing slash/** * Allows for the mu-plugins directory to be moved from the default location. * * @since 2.8.0 */if ( !defined('WPMU_PLUGIN_URL') )define( 'WPMU_PLUGIN_URL', WP_CONTENT_URL . '/mu-plugins' ); // full url, no trailing slash/** * Allows for the mu-plugins directory to be moved from the default location. * * @since 2.8.0 * @deprecated */if ( !defined( 'MUPLUGINDIR' ) )define( 'MUPLUGINDIR', 'wp-content/mu-plugins' ); // Relative to ABSPATH.  For back compat.}/** * Defines cookie related WordPress constants * * Defines constants after multisite is loaded. Cookie-related constants may be overridden in ms_network_cookies(). * @since 3.0.0 */function wp_cookie_constants( ) {global $wp_default_secret_key;/** * Used to guarantee unique hash cookies * @since 1.5 */if ( !defined( 'COOKIEHASH' ) ) {$siteurl = get_site_option( 'siteurl' );if ( $siteurl )define( 'COOKIEHASH', md5( $siteurl ) );elsedefine( 'COOKIEHASH', '' );}/** * Should be exactly the same as the default value of SECRET_KEY in wp-config-sample.php * @since 2.5.0 */$wp_default_secret_key = 'put your unique phrase here';/** * @since 2.0.0 */if ( !defined('USER_COOKIE') )define('USER_COOKIE', 'wordpressuser_' . COOKIEHASH);/** * @since 2.0.0 */if ( !defined('PASS_COOKIE') )define('PASS_COOKIE', 'wordpresspass_' . COOKIEHASH);/** * @since 2.5.0 */if ( !defined('AUTH_COOKIE') )define('AUTH_COOKIE', 'wordpress_' . COOKIEHASH);/** * @since 2.6.0 */if ( !defined('SECURE_AUTH_COOKIE') )define('SECURE_AUTH_COOKIE', 'wordpress_sec_' . COOKIEHASH);/** * @since 2.6.0 */if ( !defined('LOGGED_IN_COOKIE') )define('LOGGED_IN_COOKIE', 'wordpress_logged_in_' . COOKIEHASH);/** * @since 2.3.0 */if ( !defined('TEST_COOKIE') )define('TEST_COOKIE', 'wordpress_test_cookie');/** * @since 1.2.0 */if ( !defined('COOKIEPATH') )define('COOKIEPATH', preg_replace('|https?://[^/]+|i', '', get_option('home') . '/' ) );/** * @since 1.5.0 */if ( !defined('SITECOOKIEPATH') )define('SITECOOKIEPATH', preg_replace('|https?://[^/]+|i', '', get_option('siteurl') . '/' ) );/** * @since 2.6.0 */if ( !defined('ADMIN_COOKIE_PATH') )define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH . 'wp-admin' );/** * @since 2.6.0 */if ( !defined('PLUGINS_COOKIE_PATH') )define( 'PLUGINS_COOKIE_PATH', preg_replace('|https?://[^/]+|i', '', WP_PLUGIN_URL)  );/** * @since 2.0.0 */if ( !defined('COOKIE_DOMAIN') )define('COOKIE_DOMAIN', false);}/** * Defines cookie related WordPress constants * * @since 3.0.0 */function wp_ssl_constants( ) {/** * @since 2.6.0 */if ( !defined('FORCE_SSL_ADMIN') )define('FORCE_SSL_ADMIN', false);force_ssl_admin(FORCE_SSL_ADMIN);/** * @since 2.6.0 */if ( !defined('FORCE_SSL_LOGIN') )define('FORCE_SSL_LOGIN', false);force_ssl_login(FORCE_SSL_LOGIN);}/** * Defines functionality related WordPress constants * * @since 3.0.0 */function wp_functionality_constants( ) {/** * @since 2.5.0 */if ( !defined( 'AUTOSAVE_INTERVAL' ) )define( 'AUTOSAVE_INTERVAL', 60 );/** * @since 2.9.0 */if ( !defined( 'EMPTY_TRASH_DAYS' ) )define( 'EMPTY_TRASH_DAYS', 30 );if ( !defined('WP_POST_REVISIONS') )define('WP_POST_REVISIONS', true);}/** * Defines templating related WordPress constants * * @since 3.0.0 */function wp_templating_constants( ) {/** * Filesystem path to the current active template directory * @since 1.5.0 */define('TEMPLATEPATH', get_template_directory());/** * Filesystem path to the current active template stylesheet directory * @since 2.1.0 */define('STYLESHEETPATH', get_stylesheet_directory());/** * Slug of the default theme for this install. * Used as the default theme when installing new sites. * Will be used as the fallback if the current theme doesn't exist. * @since 3.0.0 */if ( !defined('WP_DEFAULT_THEME') )define( 'WP_DEFAULT_THEME', 'twentyeleven' );}?>

这个文件其实是定义一些常量的函数。一共有wp_initial_constants( ){初始常量}，wp_plugin_directory_constants（）{插件目录常量}，wp_cookie_constants（）{cookie常量}，wp_ssl_constants（）{ssl常量}，wp_functionality_constants（）{相关功能性的常量}，wp_templating_constants( ){模板常量}。一共6个函数。