Pass a PHP string to a JavaScript variable (and escape newlines)

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65835058/javascript-functions-breaking-with-comma-in-string-from-php

Answer 1

Expanding on someone else's answer:

<script>
  var myvar = <?php echo json_encode($myVarValue); ?>;
</script>

Using json_encode() requires:

• PHP 5.2.0 or greater
• $myVarValue encoded as UTF-8 (or US-ASCII, of course)

Since UTF-8 supports full Unicode, it should be safe to convert on the fly.

Note that because json_encode escapes forward slashes, even a string that contains </script> will be escaped safely for printing with a script block.