如何從包含的PHP類中調用方法？

Question

home.php

<?php 
include 'myClass.php'; 

$sampleClass=main; 
$sampleClass->renderHtml(); 

?> 

myClass.php

<?php 
class main 
{ 
    public $var="apple"; 

    public function renderHtml() 
    { 
     echo "This is $var"; 
     return; 
    } 
} 

現在，當我這樣做，我收到一個錯誤，它說：

Fatal error: Call to a member function renderHtml() on a 
non-object in C:\wamp\www\home.php on line 5 

Answer 1

include 'myClass.php'; 

// first create a new object 
$sampleClass = new main(); 

// call object method 
$sampleClass->renderHtml(); 

myClass.php

class main 
{ 
    public $var = "apple"; 

    public function renderHtml() 
    { 
     echo "This is " . $this->var; 
    } 
} 

Answer 2

您應該使用

$sampleClass = new main(); 

Answer 3

使用

$sampleClass = new main();