I'm attempting to develop the wordpress plugin of wordpress. But I'm not sure how you can show debug information from that. Original I'm able to make use of the print_r or echo to output some variable. However in the wordpress, basically add following echo message how can i view it? I attempted to active this wordpress plugin and run it, however i overcome ten occasions message inside it. Interesting helping. ^__^

* Capitalizes the title given by $title.
function capitalizeTitle($title) {
    echo "Hello, this is debug info.";
    return strtoupper($title);

/* now add the filter */
add_filter('the_title', 'capitalizeTitle');