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WordPress-internals.md

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WordPress internals

WordPress core files in order of execution

  • index.php
  • wp-blog-header.php
  • wp-load.php
  • wp-config.php
  • wp-settings.php
  • wp-includes/version.php
  • wp-includes/compat.php
  • wp-includes/load.php
  • wp-includes/class-wp-paused-extensions-storage.php
  • wp-includes/class-wp-exception.php
  • wp-includes/class-wp-fatal-error-handler.php
  • wp-includes/class-wp-recovery-mode-cookie-service.php
  • wp-includes/class-wp-recovery-mode-key-service.php
  • wp-includes/class-wp-recovery-mode-link-service.php
  • wp-includes/class-wp-recovery-mode-email-service.php
  • wp-includes/class-wp-recovery-mode.php
  • wp-includes/error-protection.php
  • wp-includes/default-constants.php

List made with get_included_files().

WordPress Entry Points

context entry point function
front-end wp-blog-header.php:12 !is_admin()
admin GET request: wp-admin/admin.php:30 is_admin()
admin POST request: wp-admin/admin-post.php:15 is_admin()
admin upload: wp-admin/async-upload.php:16 @$_SERVER['SCRIPT_FILENAME'] === ABSPATH . 'wp-admin/async-upload.php'
AJAX call wp-admin/admin-ajax.php:20 defined('DOING_AJAX') && DOING_AJAX
WordPress cron webserver/CLI wp-cron.php:26 defined('DOING_CRON') && DOING_CRON / php_sapi_name() === 'cli'
XML-RPC protocol xmlrpc.php:29 defined('XMLRPC_REQUEST') && XMLRPC_REQUEST

Frontend low priority

context entry point function
front-end wp-comments-post.php:16 @$_SERVER['SCRIPT_FILENAME'] === ABSPATH . 'wp-comments-post.php'
front-end wp-trackback.php:12 is_trackback()

Admin low priority

context entry point function
admin wp-login.php:12 ???
admin wp-signup.php:4 ???
admin wp-mail.php:11 ???

Only during core installation and upgrade

context entry point function
admin wp-admin/install.php:36 defined('WP_INSTALLING') && WP_INSTALLING
admin wp-admin/upgrade.php:18 defined('WP_INSTALLING') && WP_INSTALLING
admin wp-activate.php:12 defined('WP_INSTALLING') && WP_INSTALLING
admin wp-admin/maint/repair.php:10 defined('WP_REPAIRING') && WP_REPAIRING

Excluded from profiling

context entry point function
front-end wp-links-opml.php:15 ???
front-end wp-includes/ms-files.php:12 ???
front-end wp-includes/js/tinymce/wp-mce-help.php:9 ???
admin wp-admin/install-helper.php:39 ???
admin wp-admin/moderation.php:10 ???

Total: 21 entry points as of version 3.9.1

See WP trac #28364