PHP防止XSS跨站脚本攻击的方法:是针对非法的HTML代码包括单双引号等，使用htmlspecialchars()函数 。
在使用htmlspecialchars()函数的时候注意第二个参数, 直接用htmlspecialchars($string) 的话,第二个参数默认是ENT_COMPAT,函数默认只是转化双引号(“), 不对单引号(‘)做转义.
所以,htmlspecialchars函数更多的时候要加上第二个参数, 应该这样用: htmlspecialchars($string,ENT_QUOTES).当然,如果需要不转化任何引号,用htmlspecialchars($string,ENT_NOQUOTES).
另外, 尽量少用htmlentities, 在全部英文的时候htmlentities和htmlspecialchars没有区别,都可以达到目的.但是,中文情况下, htmlentities却会转化所有的html代码，连同里面的它无法识别的中文字符也给转化了。
htmlentities和htmlspecialchars这两个函数对 '之类的字符串支持不好,都不能转化, 所以用htmlentities和htmlspecialchars转化的字符串只能防止XSS攻击,不能防止SQL注入攻击.
所有有打印的语句如echo，print等 在打印前都要使用htmlentities() 进行过滤，这样可以防止Xss，注意中文要写出htmlentities($name,ENT_NOQUOTES,GB2312) 。
(1).网页不停地刷新 '<meta http-equiv="refresh" content="0;">'
(2).嵌入其它网站的链接 <iframe src=http://xxxx width=250 height=250></iframe> 除了通过正常途径输入XSS攻击字符外，还可以绕过JavaScript校验，通过修改请求达到XSS攻击的目的.
<?php
//php防注入和XSS攻击通用过滤
$_GET && SafeFilter($_GET);
$_POST && SafeFilter($_POST);
$_COOKIE && SafeFilter($_COOKIE);
function SafeFilter (&$arr)
{
$ra=Array('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/','/script/','/javascript/','/vbscript/','/expression/','/applet/'
,'/meta/','/xml/','/blink/','/link/','/style/','/embed/','/object/','/frame/','/layer/','/title/','/bgsound/'
,'/base/','/onload/','/onunload/','/onchange/','/onsubmit/','/onreset/','/onselect/','/onblur/','/onfocus/',
'/onabort/','/onkeydown/','/onkeypress/','/onkeyup/','/onclick/','/ondblclick/','/onmousedown/','/onmousemove/'
,'/onmouseout/','/onmouseover/','/onmouseup/','/onunload/');
if (is_array($arr))
{
foreach ($arr as $key => $value)
{
if (!is_array($value))
{
if (!get_magic_quotes_gpc()) //不对magic_quotes_gpc转义过的字符使用addslashes(),避免双重转义。
{
$value = addslashes($value); //给单引号（'）、双引号（"）、反斜线（\）与 NUL（NULL 字符）
#加上反斜线转义
}
$value = preg_replace($ra,'',$value); //删除非打印字符，粗暴式过滤xss可疑字符串
$arr[$key] = htmlentities(strip_tags($value)); //去除 HTML 和 PHP 标记并转换为 HTML 实体
}
else
{
SafeFilter($arr[$key]);
}
}
}
}
?>
$str = 'www.90boke.com<meta http-equiv="refresh" content="0;">';
SafeFilter ($str); //如果你把这个注释掉，提交之后就会无休止刷新
echo $str;
//------------------------------php防注入和XSS攻击通用过滤-----Start--------------------------------------------//
function string_remove_xss($html) {
preg_match_all("/\<([^\<]+)\>/is", $html, $ms);
$searchs[] = '<';
$replaces[] = '<';
$searchs[] = '>';
$replaces[] = '>';
if ($ms[1]) {
$allowtags = 'img|a|font|div|table|tbody|caption|tr|td|th|br|p|b|strong|i|u|em|span|ol|ul|li|blockquote';
$ms[1] = array_unique($ms[1]);
foreach ($ms[1] as $value) {
$searchs[] = "<".$value.">";
$value = str_replace('&', '_uch_tmp_str_', $value);
$value = string_htmlspecialchars($value);
$value = str_replace('_uch_tmp_str_', '&', $value);
$value = str_replace(array('\\', '/*'), array('.', '/.'), $value);
$skipkeys = array('onabort','onactivate','onafterprint','onafterupdate','onbeforeactivate','onbeforecopy','onbeforecut','onbeforedeactivate',
'onbeforeeditfocus','onbeforepaste','onbeforeprint','onbeforeunload','onbeforeupdate','onblur','onbounce','oncellchange','onchange',
'onclick','oncontextmenu','oncontrolselect','oncopy','oncut','ondataavailable','ondatasetchanged','ondatasetcomplete','ondblclick',
'ondeactivate','ondrag','ondragend','ondragenter','ondragleave','ondragover','ondragstart','ondrop','onerror','onerrorupdate',
'onfilterchange','onfinish','onfocus','onfocusin','onfocusout','onhelp','onkeydown','onkeypress','onkeyup','onlayoutcomplete',
'onload','onlosecapture','onmousedown','onmouseenter','onmouseleave','onmousemove','onmouseout','onmouseover','onmouseup','onmousewheel',
'onmove','onmoveend','onmovestart','onpaste','onpropertychange','onreadystatechange','onreset','onresize','onresizeend','onresizestart',
'onrowenter','onrowexit','onrowsdelete','onrowsinserted','onscroll','onselect','onselectionchange','onselectstart','onstart','onstop',
'onsubmit','onunload','javascript','script','eval','behaviour','expression','style','class');
$skipstr = implode('|', $skipkeys);
$value = preg_replace(array("/($skipstr)/i"), '.', $value);
if (!preg_match("/^[\/|\s]?($allowtags)(\s+|$)/is", $value)) {
$value = '';
}
$replaces[] = empty($value) ? '' : "<" . str_replace('"', '"', $value) . ">";
}
}
$html = str_replace($searchs, $replaces, $html);
return $html;
}
//php防注入和XSS攻击通用过滤
function string_htmlspecialchars($string, $flags = null) {
if (is_array($string)) {
foreach ($string as $key => $val) {
$string[$key] = string_htmlspecialchars($val, $flags);
}
} else {
if ($flags === null) {
$string = str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $string);
if (strpos($string, '&#') !== false) {
$string = preg_replace('/&((#(\d{3,5}|x[a-fA-F0-9]{4}));)/', '&\\1', $string);
}
} else {
if (PHP_VERSION < '5.4.0') {
$string = htmlspecialchars($string, $flags);
} else {
if (!defined('CHARSET') || (strtolower(CHARSET) == 'utf-8')) {
$charset = 'UTF-8';
} else {
$charset = 'ISO-8859-1';
}
$string = htmlspecialchars($string, $flags, $charset);
}
}
}
return $string;
}
//------------------php防注入和XSS攻击通用过滤-----End--------------------------------------------//
PHP中的设置
PHP5.2以上版本已支持HttpOnly参数的设置，同样也支持全局的HttpOnly的设置，在php.ini中
----------------------------------------------------- session.cookie_httponly = -----------------------------------------------------
设置其值为1或者TRUE，来开启全局的Cookie的HttpOnly属性，当然也支持在代码中来开启：
<?php ini_set("session.cookie_httponly", 1);
// or session_set_cookie_params(0, NULL, NULL, NULL, TRUE);
?>
Cookie操作函数setcookie函数和setrawcookie函数也专门添加了第7个参数来做为HttpOnly的选项，开启方法为：
<?php
setcookie("abc", "test", NULL, NULL, NULL, NULL, TRUE);
setrawcookie("abc", "test", NULL, NULL, NULL, NULL, TRUE);
?>