PHP过滤HTML危险标签属性

[php]代码库

//屏蔽html
function checkhtml($html) {
	$html = stripslashes($html);
	if(!checkperm('allowhtml')) {
		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
						|object|param|embed';//允许的标签
			$ms[1] = array_unique($ms[1]);
			foreach ($ms[1] as $value) {
				$searchs[] = "<".$value.">";
				$value = shtmlspecialchars($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);
	}
	$html = addslashes($html);
	return $html;
}