wp_is_internal_link()
Function: Determines whether or not the specified URL is of a host included in the internal hosts list.
Source: wp-includes/link-template.php:4836
wp_is_json_media_type()
Function: Checks whether a string is a valid JSON Media Type.
Source: wp-includes/load.php:1761
wp_is_json_request()
Function: Checks whether current request is a JSON request, or is expecting a JSON response.
Source: wp-includes/load.php:1713
wp_is_jsonp_request()
Function: Checks whether current request is a JSONP request, or is expecting a JSONP response.
Source: wp-includes/load.php:1733
wp_is_large_network()
Function: Determines whether or not we have a large network.
Source: wp-includes/ms-functions.php:2646
wp_is_large_user_count()
Function: Determines whether the site has a large number of users.
Source: wp-includes/user.php:1472
wp_is_local_html_output()
Function: Checks whether a given HTML string is likely an output from this WordPress site.
Source: wp-includes/https-detection.php:204
wp_is_maintenance_mode()
Function: Check if maintenance mode is enabled.
Source: wp-includes/load.php:324
wp_is_mobile()
Function: Test if the current browser runs on a mobile device (smart phone, tablet, etc.)
Source: wp-includes/vars.php:148
wp_is_numeric_array()
Function: Determines if the variable is a numeric-indexed array.
Source: wp-includes/functions.php:5174