在另一个类中调用函数的两种方法不同吗 - Is it different between two way to call a function in an other class?

Is it different between two way to call a function in an other class?

我有一个类

<?php
class Test{
    public function printword($word){
         echo $word;
    }
}
?>

在另一门课上，我称之为

<?php
//Included needed files !!!
$w = 'Hello';
//Way 1
$a = new Test;
$result = $a->printword($w);
//Way 2
$result = Test::printword($w);
?>

它不同吗？

而且$a = new Test;还是$a = new Test();是对的？

是的，不同。如果您声明一个方法static使它们可以访问，而不需要类的实例化。

class Test{
    public function printword($word){
        echo $word;
   }
}
//Call printword method
$a= new Test();
$a->printword('Words to print');

静态方法：

class Test{
    public static function printword($word){
        echo $word;
   }
}
//Do not need to instantiation Test class
Test::printword('Words to print');

请参阅文档。