Converts a PHP variable into its JavaScript equivalent.
We use HTML-safe strings, with several characters escaped.
function drupal_json_encode($var) {
// The PHP version cannot change within a request.
static $php530;
if (!isset($php530)) {
$php530 = version_compare(PHP_VERSION, '5.3.0', '>=');
}
if ($php530) {
// Encode <, >, ', &, and " using the json_encode() options parameter.
return json_encode($var, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
}
// json_encode() escapes <, >, ', &, and " using its options parameter, but
// does not support this parameter prior to PHP 5.3.0. Use a helper instead.
include_once DRUPAL_ROOT . '/includes/json-encode.inc';
return drupal_json_encode_helper($var);
}