Trigger custom code when wordpress post inserted or updated

Hello

If i wanted to modify a wordpress theme such that some of my custom code was ran when a post is inserted or updated (either before or after the insert - probably -after actually) please could you advise how i woudl go about doing this. Even a simple example which just echoed hello world to screen after an insert/update would be much appreciated

Thanks
andiejeAsked:
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Tom BeckConnect With a Mentor Commented:
I'm not a Wordpress expert, but there is the "save_post" hook. Something like this in your theme functions.php file perhaps:
function my_custom_after_post_code( $post_id ) {

	echo "Hello";
}
add_action( 'save_post', 'my_custom_after_post_code' );

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http://codex.wordpress.org/Plugin_API/Action_Reference/save_post
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