PHP如何防止XSS攻击与XSS攻击原理的讲解

<?PHP
/**
 * @param $string
 * @param $low 安全别级低
 */
function clean_xss(&$string, $low = False)
{
 if (! is_array ( $string ))
 {
 $string = trim ( $string );
 $string = strip_tags ( $string );
 $string = htmlspecialchars ( $string );
 if ($low)
 {
  return True;
 }
 $string = str_replace ( array ('"', "\\", "'", "/", "..", "../", "./", "//" ), '', $string );
 $no = '/%0[0-8bcef]/';
 $string = preg_replace ( $no, '', $string );
 $no = '/%1[0-9a-f]/';
 $string = preg_replace ( $no, '', $string );
 $no = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S';
 $string = preg_replace ( $no, '', $string );
 return True;
 }
 $keys = array_keys ( $string );
 foreach ( $keys as $key )
 {
 clean_xss ( $string [$key] );
 }
}
//just a test
$str = 'codetc.com<meta http-equiv="refresh" content="0;">';
clean_xss($str); //如果你把这个注释掉，你就知道xss攻击的厉害了
echo $str;
?>

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session.cookie_httponly = 
-----------------------------------------------------

<?php ini_set("session.cookie_httponly", 1);  
// or session_set_cookie_params(0, NULL, NULL, NULL, TRUE);  
?>

<?php 
setcookie("abc", "test", NULL, NULL, NULL, NULL, TRUE);  
setrawcookie("abc", "test", NULL, NULL, NULL, NULL, TRUE); 
?>