PHP

Comments

// single line
/*
   multiple line
*/

Functions

• function arguments:
  • bool
  • int
  • float
  • string
  • array
  • callable
  • self
  • iterable
  • object
  • class
  • interface

OO

• namespace?
• interface?
• self?
• method
• $this?
• use?
• annotations?
• visibility:
  • private: only in this class
  • protected: only in derived classes
  • public: everywhere
• ctor

function __construct() {
  parent::__construct(); // has to be called explicitly
  ...
}

There can only be one ctor which can have function parameters.

• dtor

function __destruct() {
  parent::__destruct(); // has to be called explicitly
}

• inheritance

class B extends A
{
   public function __construct()
   {
     parent::__construct();

• trait: a trait is similar to a class, but only intended to group functionality in a fine-grained and consistent way. It is not possible to instantiate a Trait on its own. It is an addition to traditional inheritance and enables horizontal composition of behavior; that is, the application of class members without requiring inheritance.

PHP Standard Recommendation (PSR)

• PSR-1
  • each sub-word should be capitalised in both instances, with classes having an initial upper-case letter (StudlyCaps) and methods an initial lower-case letter (camelCase)
  • Class constants MUST be declared in all upper case with underscore separators
• [ PSR-3] is the logger interface
• PSR-2
• PSR-4

PDO

PHP Data Objects (PDO) is a Database Access Abstraction Layer.

Exceptions

The base Exception class provided in PHP 5 can be extended.

PHPUnit

PHPUnit provides a simple framework for creating a test suite to automate testing of functions and classes.

XDebug

• documentation see here
• activate in php.ini an restart web server
• XDebug will not automatically start a debugging session, but it needs to be activated in one of three ways
  • before starting a PHP script from command line by set the environment variable XDEBUG_CONFIG
  • calling a PHP script from a web browser by using setting the GET parameter XDEBUG_SESSION_START, by setting it as a POST parameter of through a cookie named XDEBUG_SESSION
  • last can be set by using a browser extension for XDebug

Resources

• http://php.net/manual/en/
• PHPDoc
• PHPDocumentor