在另一个php文件wordpress插件中包含一个php文件

I am trying to include a file in an another file, but nothing. No error. First I included my main file.

include('inc/onefolder/mymainfile.php');

And then I try to include secondary files in this file (mymainfile.php).

include('inc/onefolder/anotherfolder/secondaryfile.php');

try to include absolute path of your file. Use it:

$file = ABSPATH."wp-content/plugins/your-plugin/your-file.php";

in your case:

//main thing is to use ABSPATH
$file = ABSPATH."inc/onefolder/anotherfolder/secondaryfile.php";    
require( $file ); // use include if you want.

Hope it will help.

Edit:

$file = ABSPATH."wp-content/plugins/your-plugin/inc/onefolder/anotherfolder/secondaryfile.php";

Check it out, please note, you should give the exact path as written on above line. Make it clear.

• I think your path in secondary file incorrect.
• Try this include('anotherfolder/secondaryfile.php');

When you use PHP include or require in a WordPress plugin is a good idea to use WordPress specific functions to get the absolute path of the file. You can use plugin_dir_path:

include( plugin_dir_path( __FILE__ ) . 'inc/onefolder/mymainfile.php');

Plugins directory is not always at wp-content/plugins as we can read in WordPress Codex:

It's important to remember that WordPress allows users to place their wp-content directory anywhere they want, so you must never assume that plugins will be in wp-content/plugins, or that uploads will be in wp-content/uploads, or that themes will be in wp-content/themes.

So, using plugin_dir_path() assures that include will always point to the right path.