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.
PDO
PHP Data Objects (PDO) is a Database Access Abstraction Layer.
Exceptions
The base Exception class provided in PHP 5 can be extended.