打开和包含失败

Question

我真的希望有人可以帮助我，因为我已经在4天内尝试了所有东西，而我只是被卡住了。我之前有一个问题没有得到解决。

当我点击我的一个按钮“注册”时，我收到以下错误：

Warning: include(resources/includes/header.html): failed to open stream: No such file or directory in /Applications/MAMP/htdocs/website/php/global/registernumbers.php on line 5

Warning: include(): Failed opening 'resources/includes/header.html' for inclusion (include_path='.:/Applications/MAMP/bin/php/php5.6.2/lib/php') in /Applications/MAMP/htdocs/website/php/global/registernumbers.php on line 5

以下是相关代码：

header.html中：

<!-- 1 button in the header -->
    <li>
       <a href="php/global/registernumbers.php">Register 1</a> <!-- Error -->
    </li>

    <!-- registernumbers.php is called fine. I can see my <h1> and <h2> text -->

registernumbers.php：

<?php
if( !isset( $_SESSION ) ) session_start();
?>

<?php include 'resources/includes/header.html'; ?>

<h1>Register Numbers</h1>
<h2>global/registernumbers</h2>

我的文件夹结构如下所示：

  ../../php/resources/includes/header.html
        Is working, but the CSS is ofcourse not called.

        resources/includes/header.html
        This is the correct path, but here I get the error

        <?php include(ROOT_PATH . 'resources/includes/header.html'); ?>
        Does not work either

标题的路径是正确的，我甚至试图安装MAMP。 当我使用它时：

当我将header.html和registernumbers.php放在index.php所在的位置时，一切正常。

有人知道我能做些什么吗？我真的想把我的文件分成这样的文件夹。

回复后更新了代码

<?php
if( !isset( $_SESSION ) ) session_start();
?>

<?php define 'APP_ROOT', '/resources/includes/header.html'; ?>

<h1>Register Numbers</h1>
<h2>global/registernumbers</h2>

<?php define ('APP_ROOT', '/resources/includes/header.html'); ?>
// Here I do not get any errors, but the header is not called either

<?php define 'APP_ROOT', '/resources/includes/header.html'; ?>
//Parse error: syntax error, unexpected ''APP_ROOT'' (T_CONSTANT_ENCAPSED_STRING) in /Applications/MAMP/htdocs/website/php/global/registernumbers.php on line 5