PHP

Comments[edit]

// single line
/*
   multiple line
*/

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.

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

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.

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

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

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

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

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