wpdb::add_placeholder_escape() – Adds a placeholder escape string, to escape anything that resembles a printf() placeholder.
wpdb::check_connection() – Checks that the connection to the database is still up. If not, try to reconnect.
wpdb::check_safe_collation() – Check if the query is accessing a collation considered safe on the current version of MySQL.
wpdb::determine_charset() – Determines the best charset and collation to use given a charset and collation.
wpdb::esc_like() – First half of escaping for LIKE special characters % and _ before preparing for MySQL.
wpdb::placeholder_escape() – Generates and returns a placeholder escape string for use in queries returned by ::prepare().
wpdb::process_field_charsets() – Adds field charsets to field/value/format arrays generated by the wpdb::process_field_formats() method.
wpdb::process_field_formats() – Prepares arrays of value/format pairs as passed to wpdb CRUD methods.
wpdb::process_field_lengths() – For string fields, record the maximum string length that field can safely save.
wpdb::strip_invalid_text_for_column() – Strips any invalid characters from the string for a given table and column.
wpmu_checkAvailableSpace() – Determines if the available space defined by the admin has been exceeded by the user.
wpmu_current_site() – This deprecated function managed much of the site and network loading in multisite.
wpmu_get_blog_allowedthemes() – Deprecated functionality for getting themes allowed on a specific site.
wpmu_signup_blog_notification() – Send a confirmation request email to a user when they sign up for a new site. The new site will not become active until the confirmation link is clicked.
wpmu_signup_user_notification() – Send a confirmation request email to a user when they sign up for a new user account (without signing up for a site at the same time). The user account will not become active until the confirmation link is clicked.
wptexturize_primes() – Implements a logic tree to determine whether or not "7′." represents seven feet, then converts the special char into either a prime char or a closing quote char.
wpview_media_sandbox_styles() – Returns the URLs for CSS files used in an iframe-sandbox’d TinyMCE media view.
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