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';.
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