if( $_SERVER[ "HTTP_X_REQUESTED_WITH" ] && $_SERVER[ "HTTP_X_REQUESTED_WITH" ] ==="XMLHttpRequest" ){ ?> { "title" : "Data-driven Page Response", "content" : "
This page was served as JSON via Ajax. When requested via HTTP, it returns HTML markup.
" } } else { ?>This page was served as HTML via HTTP. When requested via Ajax, it returns JSON data.