[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] uasort( ) function 2nd ucfirst( ) function 2nd ucwords( ) function 2nd uksort( ) function 2nd umask( ) function 2nd unary operators - (arithmetic negation) operator autoincrement and autodecrement uncompressing and extracting PHP and Apache distributions underlining text in PDF files Unicode character encodings supported by XML parser FriBiDi extension, reordering strings for encoded character set union of two sets uniqid( ) function Unix installing PHP locale system in POSIX-style regular expressions protocol for databases shell scripting languages, comments in writing portable PHP code for determining the platform end-of-file handling end-of-line handling environment information extensions paths, handling remote files sending mail server-specific functions shell commands unlink( ) function 2nd unpack( ) function unpacking Apache and PHP source distributions unparsed XML entities unregister_tick_function( ) function unserialize( ) function unset( ) function 2nd uploaded files information about moving uploading files security and distrusting browser-supplied filenames URL rewriting, storing state information urldecode( ) function urlencode( ) function 2nd 3rd URLs decomposing (parse_url( ) function) encoding/decoding encoding/decoding strings as button strings extracting from HTML page functions for GET and POST requests https\:// opening remotely with PHP functions, security risks of parse_url( ) function session IDS, passing via US-ASCII [See ASCII] User-Agent headers user-defined functions sorting arrays with 2nd user-defined order, sorting arrays in 2nd user_error( ) function usernames authenticating current, for PHP script executing security problems with usleep( ) function usort( ) function 2nd anonymous function, using with UTF-8 character encoding printing high-bit ASCII characters |