is done by steps of 2 spaces Don't put spaces after an opening parenthesis and before a closing one. Use camelCase, not underscores, for variable, function and method names Use underscores for option/argument/parameter names. Braces always go on their own line. Use lowercase PHP native typed constants: false, true and null. When comparing a variable to a string, put the string first and use type testing when applicable Further references from: http://trac.symfony- project.org/wiki/HowToContributeToSymfony#CodingStand ards