Wordpress wp_loaded action hook

Question

I am using Shortcode exec php plugin and putting PHP code in a post via Wordpress Posts panel.

add_action( 'wp_loaded', 'echoFunction');

function echoFunction(){
    echo "someText";
}

Why doesn't this work? and how do I make it work?

Answer 1

wp_loaded is called long, long before the post content is fetched. Put that code into a plugin.

Also, you shouldn't echo anything that early. The HTTP headers aren't sent yet on wp_loaded, so you will get the Headers already sent error, and your user authentication will not work: you cannot log in anymore.