function drupal_to_js in Drupal 6

Same name and namespace in other branches

1. 4 includes/common.inc \drupal_to_js()
2. 5 includes/common.inc \drupal_to_js()

Converts a PHP variable into its Javascript equivalent.

We use HTML-safe strings, i.e. with <, > and & escaped.

3 calls to drupal_to_js()

drupal_get_js in includes/common.inc

Returns a themed presentation of all JavaScript code for the current page.

upload_js in modules/upload/upload.module

Menu-callback for JavaScript-based uploads.

_locale_rebuild_js in includes/locale.inc

(Re-)Creates the JavaScript translation file for a language.

File

includes/common.inc, line 2570

Common functions that many Drupal modules will need to reference.

Code

function drupal_to_js($var) {
  switch (gettype($var)) {
    case 'boolean':
      return $var ? 'true' : 'false';

    // Lowercase necessary!
    case 'integer':
    case 'double':
      return $var;
    case 'resource':
    case 'string':
      return '"' . str_replace(array(
        "\r",
        "\n",
        "<",
        ">",
        "&",
      ), array(
        '\\r',
        '\\n',
        '\\x3c',
        '\\x3e',
        '\\x26',
      ), addslashes($var)) . '"';
    case 'array':

      // Arrays in JSON can't be associative. If the array is empty or if it
      // has sequential whole number keys starting with 0, it's not associative
      // so we can go ahead and convert it as an array.
      if (empty($var) || array_keys($var) === range(0, sizeof($var) - 1)) {
        $output = array();
        foreach ($var as $v) {
          $output[] = drupal_to_js($v);
        }
        return '[ ' . implode(', ', $output) . ' ]';
      }

    // Otherwise, fall through to convert the array as an object.
    case 'object':
      $output = array();
      foreach ($var as $k => $v) {
        $output[] = drupal_to_js(strval($k)) . ': ' . drupal_to_js($v);
      }
      return '{ ' . implode(', ', $output) . ' }';
    default:
      return 'null';
  }
}