This is the Code Style guide for PHP. See the main page for general guidelines and guides specific to other languages.
Assume we’re using the Drupal PHP coding style unless otherwise noted here.
Always use to delimit PHP code, not the shorthand, <?, as this is the most used and supported across PHP setups and the one PHP will continue supporting in the future.
When in doubt, use PHP5 (not PHP4) coding conventions.
Class constructors should be public function __construct (), not the PHP4-style class name. Use destructors when appropriate.
Explicitly declare visibility (public, private, protected) for member variables and methods.
Do NOT use PHP closing tags for files that contain only PHP code:
The ?> at the end of code files is purposely omitted. Removing it eliminates the possibility of unwanted whitespace at the end of files which can cause header already sent errors, XHTML/XML validation issues, and other problems.
The maximum length of any line of code is 120 characters, unless it contains a string that cannot have a break in it. (This differs from Drupal’s 80-character maximum length.)
Tip: If you’re using Eclipse, add a ruler to the 120 mark to see where you should break to the next line. See [[Developer Guide: Setting Up Eclipse PDT]] for how.
ThinkUp uses PHPDocumentor to ease code maintenance and auto-generate class documentation. Include PHPDoc-style “docblocks” in all of your PHP code. When writing your documentation, please use PHPDocumentor’s syntax.
Drupal style guide states use of uppercase value keywords (TRUE, FALSE, NULL), ThinkUp user lowercase.
Unlike Drupal’s style guide, ThinkUp keeps opening and closing curly braces on the same line as the control keyword (if, else).
Some of these are inherited from PEAR: