PHP 包含在多个包含时表现得很奇怪

Question

我有以下代码:

if (include_once(dirname(__FILE__).'/file.php')
    || include_once(dirname(__FILE__).'/local/file.php')
    )
{

这会导致错误，因为 PHP 尝试包含 "1" (大概是 dirname(__FILE__).'/file.php' || dirname(__FILE__).'/local/file .php')

注释掉第二行可以使其按预期工作，但它不会使用第二个文件。我真的需要在这里使用 elseif 和代码重复吗？还是有办法让它工作？

$ php --version
PHP 5.2.6-3ubuntu4.2 with Suhosin-Patch 0.9.6.2 (cli) (built: Aug 21 2009 19:14:44)
Copyright (c) 1997-2008 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies

Answer 1

对 include 语句进行分组:

if ( (include_once dirname(__FILE__).'/file.php')
      ||
     (include_once dirname(__FILE__).'/local/file.php')
   )

参见example #4在手册页中:

<?php
// won't work, evaluated as include(('vars.php') == 'OK'), i.e. include('')
if (include('vars.php') == 'OK') {
    echo 'OK';
}

// works
if ((include 'vars.php') == 'OK') {
    echo 'OK';
}
?>