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PHP guidelines

Formatting

  • Never ever use tabs to indent, always 4 spaces
  • Indent continued lines 4 spaces
  • Use spaces around colon in conditions and loops
  • Throughout PHP 5
  • Zend coding style, strict

Code

  • Never change the memory_limit in the code
  • Avoid methods with more than 10 lines
  • Avoid classes with more than 100 lines
  • Avoid methods with more than 4 parameters
  • Prefer single quotes for strings
  • No short tags
  • Use CamelCase for classes, smallCamelCase for variables and methods, SCREAMING_SNAKE_CASE for constants
  • Never use _camelCase or _snake_case for variables, not even in templates
  • Avoid unnecessary return and else statements
  • Prefer array_key_exists over isset
  • Prefer require_once over include_once
  • Prefer implode over concatenating strings
  • Prefer colon syntax for conditions and loops within phtml templates:
<ul>
  <?php foreach ($items as $item) : ?>
     <li><?php echo $item->getName(); ?></li>
  <?php endforeach; ?>
</ul>
  • Use constants when possible
  • Avoid unnecessary doc blocks without useful content
  • Use exceptions for error handling
  • Use type hinting and defaults in method definitions
  • Avoid passing by reference