Wordpress: Shortcodes mentions

Half a year later, Nickshor mentioned a problem with the output appearing at the top of the page instead of where the shortcode was called. I responded:

For the output buffering return bit to work, you have to put ob_start() before you output anything, then after outputting, you assign ob_get_contents() to a variable and call the function ob_end_clean(), and finally return the you used.…