Chapter 4. Coding Standards

Table of Contents
Indenting and Line Length
Control Structures
Function Calls
Function Definitions
Including Code
PHP Code Tags
Header Comment Blocks
Using CVS
Example URLs
Naming Conventions
File Formats
Sample File (including Docblock Comment standards)

Note: The PEAR Coding Standards apply to code that is part of the official PEAR distribution (that is, either distributed with PHP or available for download from the PHP PEAR repository).

Indenting and Line Length

Use an indent of 4 spaces, with no tabs. If you use Emacs to edit PEAR code, you should set indent-tabs-mode to nil. Here is an example mode hook that will set up Emacs according to these guidelines (you will need to ensure that it is called when you are editing PHP files):
(defun php-mode-hook ()
  (setq tab-width 4
        c-basic-offset 4
        c-hanging-comment-ender-p nil
    (and (string-match "/\\(PEAR\\|pear\\)/" (buffer-file-name))
      (string-match "\.php$" (buffer-file-name))))))

Here are vim rules for the same thing:
set expandtab
set shiftwidth=4
set softtabstop=4
set tabstop=4

It is recommended that you break lines at approximately 75-85 characters. There is no standard rule for the best way to break a line, use your judgment and, when in doubt, ask on the PEAR Quality Assurance mailing list.