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Inside one of small custom plugins I really need to inlcude a file from another plugin, in order to be able to create and save obhect of a class that is declared there.

What I have tried and the closest is this:

include_once($plugin_url.'plugin-name/classes/event.php');

The error I get in the debug logs is the following:

PHP Warning:  include_once(http://.../plugin-name/classes/event.php): failed to open stream: no suitable wrapper could be found in ..

I wonder what would be the correct way to reuse the logic of that class to only be able to create and save objects.

Any help or guidance is much appreciated.

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Including a PHP file requires to provide its exact file path, not the URL.

Try this instead:

include_once( WP_PLUGIN_DIR . '/plugin-name/classes/event.php' );

Hope it helps.

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