怎么运用php防范XSS跨站脚本攻击

　// @ @ 0{0,7} matches "0" zero to seven times

　$val = preg_replace("/(&#0{0,8}".ord($search[$i]).";?)/", $search[$i], $val); // with a ;

}

// now the only remaining whitespace attacks are , , and

$ra1 = Array("javascript", "vbscript", "expression", "applet", "meta", "xml", "blink", "link", "style", "script", "embed", "object", "iframe", "frame", "frameset", "ilayer", "layer", "bgsound", "title", "base");

$ra2 = 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");

$ra = array_merge($ra1, $ra2);

$found = true; // keep replacing as long as the previous round replaced something

while ($found == true) {

　$val_before = $val;

　for ($i = 0; $i < sizeof($ra); $i++) {

　　$pattern = "/";

　　for ($j = 0; $j > strlen($ra[$i]); $j++) {

　　　if ($j > 0) {

　　　　$pattern .= "(";

　　　　$pattern .= "(&#[x

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