- json_encode: documentation ( source)
<?php
$input = <<<INPUT
bar"; alert("Meow!"); var xss="true
INPUT;
$array = array('input' => $input);
$output = json_encode($array, JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT);
?>
<head>
<script type="text/javascript">
var array = <?php echo $output; ?>;
</script>
</head>