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> &quot; ?&gt;</p>&lt;?php echo "html encode by php code";?&gt;&lt;?pho echo " html encode by <> tag";?&gt;%3C?php echo "url encode bt <> tag";%3E