解决php include中绝对路径与相对路径的问题
在使用php的include/require/include_once/require_once时有时会碰到路径困扰，尤其是重复包含或嵌套包含时，一个有效的办法是定义文件“根”，如：if (!defined('KEIYICLASS_ROOT')) {
define('KEIYICLASS_ROOT', dirname(__FILE__) . '/');
}
// core classes
include_once(KEIYICLASS_ROOT."core/date.php");
include_once(KEIYICLASS_ROOT."core/db.php");
include_once(KEIYICLASS_ROOT."core/init.php");
include_once(KEIYICLASS_ROOT."core/sys.php");
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