字符前加上反斜杠，包括 单引号、双引号、反斜杠 php代码

function d_addslashes($string, $force = 0) {
 if(!$globals['magic_quotes_gpc'] || $force) {
  if(is_array($string)) {
   foreach($string as $key => $val) $string[$key] = d_addslashes($val, $force);
  }
  else $string = addslashes($string);
 }
 return $string;
}