Function: Reads and decodes a JSON file.

Function: Kills WordPress execution and displays JSON response with an error message.

Function: Kills WordPress execution and displays JSONP response with an error message.

Function: Kills WordPress execution and displays XML response with an error message.

Function: Processes arguments passed to wp_die() consistently for its handlers.

Function: Wrapper for PHP filesize with filters and casting the result as an integer.

Function: Helper function to test if each of an array of file names could conflict with existing files.

Function: Helper function to check if a file name could match an existing image sub-size file name.

Function: Returns first matched extension for the mime-type, as mapped from wp_get_mime_types().

Function: Displays the favicon.ico file content.