如何从包含的php类调用方法？

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;
    }
}

现在当我这样做时，我收到一个错误，它说：

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

使用

$sampleClass = new main();

Answer 3

你应该使用

$sampleClass = new main();