plugin_basename doesn't return plugin_name within a fold in a correct way.

[nielshackius]

to add an activation action for your plugin, internally add_action('activate_{pluginname}',$function) is used.

If your plugin is within a folder its name should be: "plugin/starthere.php" so it would be add_action('activate_plugin/starthere.php',$function). Currently, however not a slash, but a backslash is returned by plugin_basename, which breaks register_activation_hook.

Fix could be:

$file= preg_replace('!\\\\+|/+!', '/', $file); //replaces even multiple backlslashes or multiple slashes by a single slash
$file= preg_replace('!^.*wp-content/plugins/!', '', $file); //removes anything before the file name

See also attaced example skript.

[nielshackius]

ExampleSkript, with different kind of paths-names (even with errors)

[Nazgul]

No traction in over a year, so closing as wontfix.

Feel free to reopen if you have patches/suggestions/...