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I know by watching the akismet plugin source how to show a custom message on the plugins page, but I want my message to appear only once after my plugin is activated.
How could i do this?
The easiest way would be to check for an stub get_option something like
$run_once = get_option('run_once');
//show your custom message here
// then update the option so this message won't show again
hope this helps
Required, but never shown