Index[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] %u format string option (DATE FORMAT() function) %u formatting directive UCASE() function ucwords() function ulimit command, operating system scalability uncompressing source code (Apache installs) underline() function underscore characters (_), variables uninitialized variables Unix Apache installs 2nd configure script make command source code, downloading source code, uncompressing Apache startups apachectl tool logresolve utility, resolving hostnames mod_ssl Apache modules MySQL, installing 2nd OpenSSL libraries, installing PHP installing 2nd 3rd integrating with Apache on rotatelogs programs syslog daemon, logging errors tail command-line utility, monitoring error logs UNIX epoch UNIX TIMESTAMP() function unlink() function, file deletion unsigned data types unsubscribe requests unsubscribe/subscribe forms, creating (mailing list subscription mechanisms) unzipper UPDATE command 2nd UPDATE statement upgrades changelogs software Apache Apache News and Announcements list determining when to upgrade maintenance releases MySQL MySQL Announcements list PHP PHP Announcements list security issues staying current when to upgrade uptime status variable URL (uniform resource locators), applying directives User-Agent headers usernames, basic authentication users adding/deleting 2nd functions 2nd 3rd input calendar example HTML forms images, creating from lists, Require directive login forms managing client authentication database file-based access control authentication file-based authentication functions ownership, verifying redirecting (forms) root users 2nd sessions destroying functions IDs, passing in query strings registered users session set save handler() function starting storing arrays in user preferences variables tables users file, backend storage /usr/local/apache2 directory /usr/local/php/lib directory /usr/local/src/ directory /usr/src/ directory utilities apxs gzip, uncompressing Apache source code htpasswd, managing user password files logresolve, resolving hostnames make, tail command-line error logs monitoring (Unix) |