In moodle 1.9 , I can set css by $CFG->stylesheets[] and js by passing
$meta to print_header(). But how can I do that in moodle 2.2 ? In moodle 2.2 $OUTPUT->header() is instead of print_header .However , $OUTPUT->header() does not need $meta . So I want to know How can i set css and js in moodle 2.2 .