PHP Basics

1,PHP Eight basic data types

int float string boolean  //  Basic data type 

array object（ object ） // Mixed type 

resource ( resources ) NULL //  Complex type 

2, PHP Super global variable

$_GET  

$_POST  

$_SERVER 

$_FILES 

$_COOKIE $_SESSION 

$_REQUEST

 $_ENV

$GLOBALS

3, PHP Magic variable

__FILE__

__DIR__

__FUNCTION__

__LINE__

__CLASS__

__METHOD__

4, PHP Magic methods – Class object

__construct()

__destroy()

__set($name ,$value)

__get($name)

__call()

__callStatic()

__tostring()

__clone()

__sleep()

__wakeup()