jquery and php

============source================================
<?php
$sbid = "box";
$texts2="test";
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
</head>
<body>
<textarea cols="80" id="box"></textarea>
<script>
var text = '<?php print $texts2; ?>';
$( "#<?php print $sbid; ?>" ).val( text );
</script>
</body>
</html>

==========output==================================
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
</head>
<body>
<textarea cols="80" id="box"></textarea>
<script>
var text = 'test';
$( "#box" ).val( text );
</script>
</body>
</html>