lp/php_improve.txt at master · manozkumarj/lp · GitHub

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* In PHP, all keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are NOT case-sensitive.
* all variable names are case-sensitive.


PHP 7 Features:
---------------------------
* Scalar datatype hinting
* Return type hinting
* Null coaleasce operator (Short form of Ternary operator)
* Combine coparision operator (Spaceship operator)
*


Magic functions:
All magic functions will start with "__"
* __autoload()
* __cunstruct($takesParams)
* __destruct()
* __get($varName) -> If we try to access any non-existing, non-accessable variable, this function will be triggered.
* __set($varName, $varValue) -> If we try to modify any non-existing, non-accessable variable, this function will be triggered.
* __call($funcName, Array $array_of_param) -> If we try to modify any non-existing, non-accessable function, this function will be triggered.
* static __callStatic($funcName, Array $array_of_param) -> If we try to modify any non-existing, non-accessable function, this function will be triggered.
* __isset($varName) -> Return boolean -> Used to check whether a property is available/public in a class.
* __unset() -> Used to unset/remove a property which is available/public in a class.
* __toString() -> If we try to echo an object of a class, this function will be triggered.
-- get_class(){
	return get_class($this);
} method is used to get class name of an object.
* __sleep() -> Will be triggered when we try to serialize an object of a class.
* __wakeup() -> Will be triggered when we try to unserialize an object of a class.
* __invoke($params) -> If we try to call an object of a class as a function, this function will be triggered.
* __clone() ->


* Inheritance =
class TVWithTimer extends TV{

}

* Encapsulation = Access Modifiers
Public, Private, Protected
* We can declare variables in interface.
* Abstract class = We can not create object for abstract class
abstract class Base{

	public $abc;
	public abstract abc(){

	}
}

We only define/declare the functions in abstract class. But classes with extends abstract class, should define all the abstract fumctions in them.

We can extend only 1 class.


* Interface =
We can not declare variables in interface.
interface abc{
	public abc();
}

class implements def{

}

We only define/declare the functions in abstract class. But classes with extends abstract class, should define all the abstract fumctions in them.

We can not create constructor function in interface.

We can not create PRIVATE functions in interface.

We can implement multiple interfaces
class C implements a,b {

}


Static variables AND methods:
----------------------------------
* ClassName::method();
Scope resolution operator

* We can not use $this to static variables. We should use self::$variable.
class xyz extents abc{

	public static function getCount(){
		parent::getCount();
	}
}

*