Invoking classes from other files in a PHP file

This time to everyone in the PHP file to call other files in the class, in the PHP file to call other file class considerations are what, the following is the actual case, take a look.

First declare a class in a tool.php file:

<?php  class Tool {  function say () {  $result = "Hello,world";  return $result;  }}

In another file, main.php calls the methods in the above class:

<?php  require_once ' tool.php ';  $tool =new tool ();  $content = $tool->say ();  Echo $content;? >

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