If Multisite is enabled.
is_user_admin
Whether the current request is for a user admin screen.
is_network_admin
Whether the current request is for the network administrative interface.
is_blog_admin
Whether the current request is for a site’s administrative interface.
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is_admin
Determines whether the current request is for an administrative interface page.
wp_clone
Copy an object.
shutdown_action_hook
Runs just before PHP shuts down execution.
wp_magic_quotes
Add magic quotes to `$_GET`, `$_POST`, `$_COOKIE`, and `$_SERVER`.
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wp_set_internal_encoding
Set internal encoding.
is_protected_ajax_action
Determines whether we are currently handling an AJAX action that should be protected against WSODs.
is_protected_endpoint
Determines whether we are currently on an endpoint that should be protected against WSODs.
wp_is_recovery_mode
Is WordPress in Recovery Mode.
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wp_skip_paused_themes
Filters a given list of themes, removing any paused themes from it.
wp_get_active_and_valid_themes
Retrieves an array of active and valid themes.
wp_skip_paused_plugins
Filters a given list of plugins, removing any paused plugins from it.