When we are outside the Sample
namespace, we should call the function by \Sample\sp_activate()
, so please try the following:
<?php
/**
* Plugin Name: Sample Plugin
* Version: 0.0.2
*/
namespace Sample;
\register_activation_hook( __FILE__, '\Sample\sp_activate' );
function sp_activate() {
}
If something is printed out during the plugin activation it will result in unexpected output message. If you use for example echo 'Hello';
in your activation function, it will generate such a message of 5 characters.
You should consider using WP_DEBUG_LOG
and log the errors into a file, to see what kind of errors you’re getting there.
I hope this helps.
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