PHP几个工具函数

function RemoveXSS($val) { ???????// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed ???????// this prevents some character re-spacing such as <java\0script> ???????// note that you have to handle splits with \n, \r, and \t later since they *are* allowed in some inputs ???????$val = preg_replace(‘/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/‘, ‘‘, $val); ???????// straight replacements, the user should never need these since they‘re normal characters ???????// this prevents like <IMG SRC=@avascript:alert(‘XSS‘)> ???????$search = ‘abcdefghijklmnopqrstuvwxyz‘; ???????$search .= ‘ABCDEFGHIJKLMNOPQRSTUVWXYZ‘; ???????$search .= ‘1234567890!@#$%^&*()‘; ???????$search .= ‘~`";:?+/={}[]-_|\‘\\‘; ???????for ($i = 0; $i < strlen($search); $i++) { ???????????// ;? matches the ;, which is optional ???????????// 0{0,7} matches any padded zeros, which are optional and go up to 8 chars ???????????????????????// @ @ search for the hex values ???????????$val = preg_replace(‘/(&#[xX]0{0,8}‘.dechex(ord($search[$i])).‘;?)/i‘, $search[$i], $val); // with a ; ???????????// @ @ 0{0,7} matches ‘0‘ zero to seven times ???????????$val = preg_replace(‘/(&#0{0,8}‘.ord($search[$i]).‘;?)/‘, $search[$i], $val); // with a ; ???????} ???????????????// now the only remaining whitespace attacks are \t, \n, and \r ???????$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 .= ‘(&#[xX]0{0,8}([9ab]);)‘; ???????????????????????$pattern .= ‘|‘; ???????????????????????$pattern .= ‘|(&#0{0,8}([9|10|13]);)‘; ???????????????????????$pattern .= ‘)*‘; ???????????????????} ???????????????????$pattern .= $ra[$i][$j]; ???????????????} ???????????????$pattern .= ‘/i‘; ???????????????$replacement = substr($ra[$i], 0, 2).‘<x>‘.substr($ra[$i], 2); // add in <> to nerf the tag ???????????????$val = preg_replace($pattern, $replacement, $val); // filter out the hex tags ???????????????if ($val_before == $val) { ???????????????????// no replacements were made, so exit the loop ???????????????????$found = false; ???????????????} ???????????} ???????} ???????return $val; ???}

function GBKtoUTF8($str){ ???if(is_array($str)) ???{ ???????foreach ($str as &$value) ????????{ ???????????$value = GBKtoUTF8($value); ???????} ???????return $str; ???????????????}elseif(is_string($str)){ ??????????$str = iconv("GB18030", "UTF-8//IGNORE", $str); ???????return $str; ???}else{ ???????return $str; ???}}

function UTF8toGBK(&$str){ ???if(is_array($str)) ???{ ???????foreach ($str as &$value) ????????{ ???????????$value = UTF8toGBK($value); ???????} ???????return $str; ???????????????}elseif (is_string($str)){ ??????????$str = iconv("UTF-8", "GB18030//IGNORE", $str); ???????return $str; ???}else{ ???????return $str; ???}}