In the course of working on WordPress, and plugins and such for WordPress, I frequently find myself at a loss to remember the name of constants provided by the system. Hey, isn’t there a constant for such-and-such directory?
I did a bit of grepping and parsing just now, and in the hopes that it might be of use to my fellow WordPress hackers, here is my list of every defined CONSTANT in the latest WordPress 2.7-bleeding setup.
ABSPATH ADMIN_COOKIE_PATH APP_REQUEST ARRAY_A ARRAY_N ATOM AUTH_COOKIE AUTH_KEY AUTOSAVE_INTERVAL COMMENTS_TEMPLATE COOKIEHASH COOKIEPATH COOKIE_DOMAIN CRLF CUSTOM_TAGS DB_CHARSET DB_COLLATE DB_HOST DB_NAME DB_PASSW DB_PASSWORD DB_USER DOING_AJAX DOING_AUTOSAVE DOING_CRON EP_ALL EP_ATTACHMENT EP_AUTHORS EP_CATEGORIES EP_COMMENTS EP_DATE EP_DAY EP_MONTH EP_NONE EP_PAGES EP_PERMALINK EP_ROOT EP_SEARCH EP_TAGS EP_YEAR EZSQL_VERSION FORCE_SSL_ADMIN FORCE_SSL_LOGIN FTP_ASCII FTP_AUTOASCII FTP_BINARY FTP_FORCE FTP_OS_Mac FTP_OS_Unix FTP_OS_Windows IS_PROFILE_PAGE JSON_BOOL JSON_END_ARRAY JSON_END_OBJ JSON_FLOAT JSON_INT JSON_IN_ARRAY JSON_IN_BETWEEN JSON_IN_OBJECT JSON_KEY JSON_NULL JSON_SKIP JSON_START_ARRAY JSON_START_OBJ JSON_STR LANGDIR LOGGED_IN_COOKIE LOGGED_IN_KEY MAGPIE_CACHE_AGE MAGPIE_CACHE_DIR MAGPIE_CACHE_FRESH_ONLY MAGPIE_CACHE_ON MAGPIE_DEBUG MAGPIE_FETCH_TIME_OUT MAGPIE_INITALIZED MAGPIE_USER_AGENT MAGPIE_USE_GZIP MAX_EXECUTION_TIME MAX_RESULTS MC_LOGGER_DEBUG MC_LOGGER_ERROR MC_LOGGER_FATAL MC_LOGGER_INFO MC_LOGGER_WARN OBJECT OBJECT_K PASS_COOKIE PCLZIP_ATT_FILE_NAME PCLZIP_ATT_FILE_NEW_FULL_NAME PCLZIP_ATT_FILE_NEW_SHORT_NAME PCLZIP_CB_POST_ADD PCLZIP_CB_POST_DELETE PCLZIP_CB_POST_EXTRACT PCLZIP_CB_POST_LIST PCLZIP_CB_PRE_ADD PCLZIP_CB_PRE_DELETE PCLZIP_CB_PRE_EXTRACT PCLZIP_CB_PRE_LIST PCLZIP_ERROR_EXTERNAL PCLZIP_ERR_ALREADY_A_DIRECTORY PCLZIP_ERR_BAD_CHECKSUM PCLZIP_ERR_BAD_EXTENSION PCLZIP_ERR_BAD_EXTRACTED_FILE PCLZIP_ERR_BAD_FORMAT PCLZIP_ERR_DELETE_FILE_FAIL PCLZIP_ERR_DIRECTORY_RESTRICTION PCLZIP_ERR_DIR_CREATE_FAIL PCLZIP_ERR_FILENAME_TOO_LONG PCLZIP_ERR_INVALID_ARCHIVE_ZIP PCLZIP_ERR_INVALID_ATTRIBUTE_VALUE PCLZIP_ERR_INVALID_OPTION_VALUE PCLZIP_ERR_INVALID_PARAMETER PCLZIP_ERR_INVALID_ZIP PCLZIP_ERR_MISSING_FILE PCLZIP_ERR_MISSING_OPTION_VALUE PCLZIP_ERR_NO_ERROR PCLZIP_ERR_READ_OPEN_FAIL PCLZIP_ERR_RENAME_FILE_FAIL PCLZIP_ERR_UNSUPPORTED_COMPRESSION PCLZIP_ERR_UNSUPPORTED_ENCRYPTION PCLZIP_ERR_USER_ABORTED PCLZIP_ERR_WRITE_OPEN_FAIL PCLZIP_OPT_ADD_COMMENT PCLZIP_OPT_ADD_PATH PCLZIP_OPT_BY_EREG PCLZIP_OPT_BY_INDEX PCLZIP_OPT_BY_NAME PCLZIP_OPT_BY_PREG PCLZIP_OPT_COMMENT PCLZIP_OPT_CRYPT PCLZIP_OPT_EXTRACT_AS_STRING PCLZIP_OPT_EXTRACT_DIR_RESTRICTION PCLZIP_OPT_EXTRACT_IN_OUTPUT PCLZIP_OPT_NO_COMPRESSION PCLZIP_OPT_PATH PCLZIP_OPT_PREPEND_COMMENT PCLZIP_OPT_REMOVE_ALL_PATH PCLZIP_OPT_REMOVE_PATH PCLZIP_OPT_REPLACE_NEWER PCLZIP_OPT_SET_CHMOD PCLZIP_OPT_STOP_ON_ERROR PCLZIP_READ_BLOCK_SIZE PCLZIP_SEPARATOR PCLZIP_TEMPORARY_DIR PLUGINDIR PLUGINS_COOKIE_PATH RSS SECRET_KEY SECURE_AUTH_COOKIE SECURE_AUTH_KEY SITECOOKIEPATH STATUS_INTERVAL STYLESHEETPATH TEMPLATEPATH TEST_COOKIE USER_COOKIE WPINC WP_ADMIN WP_CONTENT_DIR WP_CONTENT_URL WP_DEBUG WP_IMPORTING WP_INSTALLING WP_LANG_DIR WP_MEMORY_LIMIT WP_PLUGIN_DIR WP_PLUGIN_URL WP_UNINSTALL_PLUGIN WP_USE_THEMES WXR_VERSION
[Note: Comment originally posted to previous post. Moved here for obvious reasons… — ed.]
Hey, this is actually a comment for the next post about constant, but… you forgot to define a fun quizz for this post so nobody can comment because there’s no question to answer and yet the plugin won’t let any comment make it through
Idea for improvement here?
Anyway, my comment was: what would help even more fellow hackers would be to mention which constants were designed to be user defined in wp-config.php (ie constants enclosed in a “if !defined then define”)
Wow. That there would constitute a significant bug in my quiz plugin. That’s why it’s a beta — to discover these issues before final release. Thanks for letting me know.
True. I didn’t go full boat with this, but there are definitely times when I’m trying to remember if such and such constant exists, or what the name is. This list will help jog my memory — at least let me know what to look for.
Although most of the posts here are not in English (as far as I am concerned), I am trying for the past few days to write perhaps the world’s simplest plugin i.e. setting one’s favicon. Along with the process, I am learning PHP and the WP system itself, so I have a long way to go to parse much of what you talk about here.
But your website looks like a great hub of info for me. Thanks for putting such stuff up. From Pakistan, peace out.
God bless and good luck,
M.
Momehk — Welcome to WordPress hacking!
Here’s my two-second “How to write plugins” class: learn about add_action and add_filter
In your case (just off the top of my head) I think you want to do something like this:
way ahead of you broda
Thanks.
But Right now I just can not find any docs on register_settings to write plugins. Guess a good plugin author would use that activation function still, right?
And More importantly, I can set and reset the favicon etc. That bit is done. Now I want to have the option of uploading an image. The validation of the image is for later (that its a png or an ico file, is a certain size etc). But I have no clue as to HOW to upload images and store them through a plugin’s options page.
Any hints on that? Thanks either way.
P.S. I have also made bare-bones plugin that replaces the site title from text to an image (stole the code from kubrick, which injects css into the main page
), so yea, its a steep learning curve here 
“I just can not find any docs on register_settings to write plugins.”
Check out Otto’s WordPress Settings API Tutorial
thanks man, appreciated.
Nice collection. The same I got from Here