The following typographic conventions are used in this book:
is used for filenames, directories, command names, module names, function calls, command-line switches, and Apache file directives. It is also used for email addresses and URLs.
is used for code examples. It is also used for constants and data structures.
Constant Width Bold
is used to mark user input in examples.
Constant Width Italic
is used to mark replaceables in examples.