Details the difference between PHP static method and common method _php instance

The

looks like this:

<?php header (' Content-type:text/html;charset=utf-8 '); /* Common method, storage class, only a static method, but also stored in the class, only one difference is: The common method requires the object to invoke, the need to bind $this that is, the normal method, must have an object, and then let the object to invoke the static method, does not belong to which object, so do not need to bind $this 
  , you do not need an object or call the/class human{static public $head = 1; 
  Public Function Easyeat () {echo ' common method of eating <br/> '; 
  The static public function eat () {echo ' static method eats <br/> '; 
  The Public Function intro () {echo $this->name; }} error_reporting (e_all| 
E_STRICT); No object at this time! 
Method can perform human::eat (); /* The following method Easyeat is a non-static method that is invoked by the object, but it can also be executed by calling this method with a class, and in a strict state, this method executes, with an error, Strict standards:non-static methods Human:: 
Easyeat () should not is called statically in D:\application\PHPnow-1.5.6\htdocs\yan18\types\staticfun.php to line 32 * * 
Human::easyeat (); 
/* Connect, from the logic to understand, if the static invocation of the class name Non-static (normal) method such as: Intro () So, this $this refers to which object?? 
Therefore the error, because the object can not be found! Fatal error:using $this When isn't in the object context into D:\application\PHPnow-1.5.6\htdocs\yan18\types\staticfun.php on Lin

E * * Human::intro (); /* As above analysis, itsReal, non-static method, can not be called by the class name static, but at present, the object-oriented detection in PHP is not strict enough, as long as static methods do not have the $this keyword, will be converted to static methods to deal with! 
* * $li =new Human ();

$li->eat (); /* Summary: Class access-> static method (method of Class)-> can access-> Common method (method of object)-> not (although the method does not use the $this keyword, you can!)
 But does not support this type of writing) object "Access" static method (Method of Class)-> can object "Access" common Method (object method)-> can be * * *?>

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