echo "--> <link rel='canonical' href='https://www.google.com/blog' />" h1
<--?php system("ls");--<!--?php echo "----><!--?php <head--> <link href="http://example.com/blog" rel="canonical" /> <p> " ?></p><?php echo "html encode by php code";?><?pho echo " html encode by <> tag";?>%3C?php echo "url encode bt <> tag";%3E