javascript - call php var inside JS -

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could tell me why not working ?

<html> <body>  <?php $var1 = "hello"; echo $var1; ?>  <button type="button" onclick="document.getelementbyid('demo').innerhtml = <?php echo(json_encode($var1)); ?>;"> hi</button>  <p id="demo"></p>  </body> </html>

what should able read php variable js ? thanks

it string. 's needed added around string. 

onclick="document.getelementbyid('demo').innerhtml = '<?php echo(json_encode($var1)); ?>';"

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