Calling static properties and static methods in PHP object-oriented

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<?php

header("content-type:text/html;charset=utf-8");

classHuman{

staticpublic$name= "Little Sister";

public$height= 180 ;

staticpublicfunctiontell(){

echoself::$name; //Static method calls static properties, use self keyword

//echo $this->height;//Wrong. Static methods cannot call non-static properties

//Because $this represents an instantiated object, and here is a class, I don’t know which object $this represents                                                

}

publicfunctionsay(){

echoself::$name. "I spoke" ;

//Normal methods call static properties, also using the self keyword

echo$this->height;

}

}

$p1= newHuman();

$p1->say();

$p1->tell();//Object can access static methods

echo$p1::$name;//Object access static properties. You cannot access $p1->name like this

//Because the memory location of the static attribute is not in the object

Human::say();//Wrong. An error occurs when the say() method has $this; the result can be obtained without $this

//But php5.4 or above will prompt

?> ,Static methods can call non-static methods, using the self keyword. In PHP, after a method is called self::, it is automatically converted into a static method;