Hook into a plugin

Just to expand a bit more.

I’m trying to write a plugin that hooks into Contact Form 7’s submit function. There are many extensions for this plugin, so perhaps someone can just give me a brief idea of how to do it?

Thanks

//example

function hello_world(){
echo ‘Hi World!’;
}
add_action(‘the_post’,’hello_world’);

//where the ‘the_post’ is the hook and the ‘hello_world’ is the function to be executed.

Thanks dunhakdis

That’s for plugging into WordPress, but what I was really looking for I managed to find last night after sifting through a lot of code.

To hook into ANOTHER plugin – in this case it was contact form 7 – and indeed it was as easy as plugging into wordpress:

add_action('wpcf7_before_send_mail', 'my_function');

Thanks for your help though ??

You can hook into any functions as long as it is supported though ??