To quickly look up a PHP function go to %php.net/strlen% At the bottom of every page of the online manual you will find user-contributed notes. There is usually a lot of good information (and some bad) in these notes. The search box at the top of the page can be used to search the manual, entire site, mailing lists or the bug database. Use %Alt-S% to move your cursor to the search box quickly, or on the manual pages you can use %Alt-L% to jump to the function lookup field. Every page of the site has a %show source% link at the bottom so you can see the PHP source behind that page. In the bottom right corner you will find a %mirror sites% link. Please choose a mirror near you. As a general rule, each country will have a number of mirror sites named <country_code>.php.net. For example, %de.php.net%, %de2.php.net%, %kr.php.net%, %kr2.php.net%.