CI（CodeIgniter）框架中URL特殊字符处理与SQL注入隐患分析

#$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';
$config['permitted_uri_chars'] ='a-z 0-9~%.:_\-\+=()';

function escape_str($str, $like = FALSE)
{
  var_dump($str);
  echo "\n" ;
  if (is_array($str))
  {
    foreach ($str as $key =  $val)
    {
      $str[$key] = escape_str($val, $like);
    }
    return $str;
  }
  if (function_exists('mysql_real_escape_string'))
  {
    $str = addslashes($str);
  }
  elseif (function_exists('mysql_escape_string'))
  {
    $str = mysql_escape_string($str);
  }
  else
  {
    $str = addslashes($str);
  }
  // escape LIKE condition wildcards
  if ($like === TRUE)
  {
    $str = str_replace(array('%', '_'), array('\%', '\_'), $str);
  }
  return $str;
}

xx". $this- db- escape ( $xxx )."xx

$arr = array(
  'name'= "2' and 1=2",
  "hello'"= "2");
);