How to pass JSON with single quote from PHP to Javascript through HTML?

I am attempting to pass some text from my PHP code to Javascript through HTML. It works fine unless the text has a single quote. Here is how I am doing it:

<script>

     var t = '<?php echo json_encode(an array containing text "he's here");?>';

</script>

I tried changing the single quotes around the php echo to double quotes. but, of course, JSON uses double quotes, so I had the same problem.