Adding the priority 999999 to the call to 'init', 'system' won't change the plugin order in the admin panel. It does however make sure that the plugin is loaded last (after all the other plugins have been loaded). The same way as it would be loaded if it had default priority and was at the bottom of the plugin list.

I want to do it programatically only beacuse im using elgg multisite by marcus povey

Thanks for the quick response,
but it is not making any difference, I have tried that already, if i place my plugin at the bottom, it overrides the search in the header but after setting elgg_register_event_handler('init', 'system', 'myplugin_init', 999999); it does not do that.

As I said: the plugin does not have to be at the bottom of the list if the priority has been set explicitly by passing in the priority parameter.

Is there some reason why this is not enough?

How are you overriding the search?

My bad. The registration order does not apparently affect view loading after all. (Assuming you are overriding a view in your pluigin.)

Maybe you could add something like $plugin->setPriority('last'); to the activate.php. I'm not completely sure if that would work. activate.php may be too early.

@Rohit

You can add a kind of priority in manifest.xml. Like,

<requires>
    <type>priority</type>
    <priority>after</priority>
    <plugin>search</plugin>
</requires>

@gille i have done that but it only indicates in administration that the plugin requires to be place below another plugin, but id does not do that automatically.

@ Juho Jaakkola  yes im trying to override search view in my plugin.

@Rohit I see, did you try what Juho suggested, maybe in your plugin init?

$plugin = elgg_get_plugin_from_id('myplugin');
$plugin->setPriority('last');