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

Answer 1

The paranoid version: Escaping every single character.

function javascript_escape($str) {
  $new_str = '';

  $str_len = strlen($str);
  for($i = 0; $i < $str_len; $i++) {
    $new_str .= '\\x' . sprintf('%02x', ord(substr($str, $i, 1)));
  }

  return $new_str;
}

EDIT: The reason why json_encode() may not be appropriate is that sometimes, you need to prevent " to be generated, e.g.