The use of self,$this,const,static,-> in php_PHP tutorial

After using PHP for so long, I feel ashamed that I still haven’t figured out how to use these keywords. Let’s summarize today.

1. When the internal method of a class accesses attributes that have been declared as const and static, use the form of self::$name. Note that the declaration format of the const attribute is const PI=3.14, not const $PI=3.14

以下为引用的内容：
class clss_a { 
private static $name="static class_a"; 
const PI=3.14; 
public $value; 
public static function getName() 
{ 
return self::$name; 
} 
//这种写法有误，静态方法不能访问非静态属性 
public static function getName2() 
{ 
return self::$value; 
} 
public function getPI() 
{ 
return self::PI; 
} 
}

The following is the quoted content:

class clss_a { private static $name="static class_a" ; const PI=3.14; public $value; public static function getName() {

return self::$name;

} //This kind Wrong writing, static methods cannot access non-static properties public static function getName2() { return self::$value; } public function getPI()

{ return self::PI;

}

}

Another thing to note is that if a class method is static, the properties it accesses must also be static. 2. When the internal method of a class accesses attributes that are not declared const or static, use the form $this->value ='class_a';.

http://www.bkjia.com/PHPjc/364393.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/364393.htmlTechArticleAfter using PHP for so long, I feel ashamed that I still haven’t figured out how to use these keywords. . Let’s summarize today. 1. The internal method access of the class has been declared as const and sta...