Function: Check if object is profile menu item.
Function: Get the IDs of answer by question ID.
Function: Whitelist array items.
Function: Append table name in $wpdb.
Function: Check if $_REQUEST var exists and get value. If not return default.
Function: Get active list filter by filter key.
Function: Sanitize and unslash string or array or post/get value at the same time.
Function: Get total numbers of solved question.
Function: Get current sorting type.
Function: Remove white space from string.