php防sql注入过滤代码 php防sql注入过滤代码防止sql注入的函数，过滤掉那些非法的字符,提高sql安全性，同时也可以过滤XSS的攻击。function filter($str) { if (empty($str)) return false; $str = htmlspecialchars($str); $str = str_replace( '/', "", $str); $str = str_replace( '"', "", $str); $str = str_replace( '(', "", $str); $str = str_replace( ')', "", $str); $str = str_replace( 'CR', "", $str); $str = str_replace( 'ASCII', "", $str); $str = str_replace( 'ASCII 0x0d', "", $str); $str = str_replace( 'LF', "", $str); $str = str_replace( 'ASCII 0x0a', "", $str); $str = str_replace( ',', "", $str); $str = str_replace( '%', "", $str); $str = str_replace( ';', "", $str); $str = str_replace( 'eval', "", $str); $str = str_replace( 'open', "", $str); $str = str_replace( 'sysopen', "", $str); $str = str_replace( 'system', "", $str); $str = str_replace( '$', "", $str); $str = str_replace( "'", "", $str); $str = str_replace( "'", "", $str); $str = str_replace( 'ASCII 0x08', "", $str); $str = str_replace( '"', "", $str); $str = str_replace( '"', "", $str); $str = str_replace("", "", $str); $str = str_replace("&gt", "", $str); $str = str_replace("&lt", "", $str); $str = str_replace("<SCRIPT>", "", $str); $str = str_replace("</SCRIPT>", "", $str); $str = str_replace("<script>", "", $str); $str = str_replace("</script>", "", $str); $str = str_replace("select","",$str); $str = str_replace("join","",$str); $str = str_replace("union","",$str); $str = str_replace("where","",$str); $str = str_replace("insert","",$str); $str = str_replace("delete","",$str); $str = str_replace("update","",$str); $str = str_replace("like","",$str); $str = str_replace("drop","",$str); $str = str_replace("DROP","",$str); $str = str_replace("create","",$str); $str = str_replace("modify","",$str); $str = str_replace("rename","",$str); $str = str_replace("alter","",$str); $str = str_replace("cas","",$str); $str = str_replace("&","",$str); $str = str_replace(">","",$str); $str = str_replace("<","",$str); $str = str_replace(" ",chr(32),$str); $str = str_replace(" ",chr(9),$str); $str = str_replace(" ",chr(9),$str); $str = str_replace("&",chr(34),$str); $str = str_replace("'",chr(39),$str); $str = str_replace("<br />",chr(13),$str); $str = str_replace("''","'",$str); $str = str_replace("css","'",$str); $str = str_replace("CSS","'",$str); $str = str_replace("<!--","",$str); $str = str_replace("convert","",$str); $str = str_replace("md5","",$str); $str = str_replace("passwd","",$str); $str = str_replace("password","",$str); $str = str_replace("../","",$str); $str = str_replace("./","",$str); $str = str_replace("Array","",$str); $str = str_replace("or 1='1'","",$str); $str = str_replace(";set|set&set;","",$str); $str = str_replace("`set|set&set`","",$str); $str = str_replace("--","",$str); $str = str_replace("OR","",$str); $str = str_replace('"',"",$str); $str = str_replace("*","",$str); $str = str_replace("-","",$str); $str = str_replace("+","",$str); $str = str_replace("/","",$str); $str = str_replace("=","",$str); $str = str_replace("'/","",$str); $str = str_replace("-- ","",$str); $str = str_replace(" -- ","",$str); $str = str_replace(" --","",$str); $str = str_replace("(","",$str); $str = str_replace(")","",$str); $str = str_replace("{","",$str); $str = str_replace("}","",$str); $str = str_replace("-1","",$str); $str = str_replace("1","",$str); $str = str_replace(".","",$str); $str = str_replace("response","",$str); $str = str_replace("write","",$str); $str = str_replace("|","",$str); $str = str_replace("`","",$str); $str = str_replace(";","",$str); $str = str_replace("etc","",$str); $str = str_replace("root","",$str); $str = str_replace("//","",$str); $str = str_replace("!=","",$str); $str = str_replace("$","",$str); $str = str_replace("&","",$str); $str = str_replace("&&","",$str); $str = str_replace("==","",$str); $str = str_replace("#","",$str); $str = str_replace("@","",$str); $str = str_replace("mailto:","",$str); $str = str_replace("CHAR","",$str); $str = str_replace("char","",$str); return $str; } 更加简便的防止sql注入的方法（推荐使用这个）： if (!get_magic_quotes_gpc()) // 判断magic_quotes_gpc是否为打开 { $post = addslashes($name); // magic_quotes_gpc没有打开的时候把数据过滤 } $name = str_replace("_", "\_", $name); // 把 '_'过滤掉 $name = str_replace("%", "\%", $name); // 把' % '过滤掉 $name = nl2br($name); // 回车转换 $name= htmlspecialchars($name); // html标记转换 return $name; PHP防XSS 防SQL注入的代码/** * 过滤参数 * @param string $str 接受的参数 * @return string */ static public function filterWords($str) { $farr = array( "/<(\\/?)(script|i?frame|style|html|body|title|link|meta|object|\\?|\\%)([^>]*?)>/isU", "/(<[^>]*)on[a-zA-Z]+\s*=([^>]*>)/isU", "/select|insert|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile|dump/is" ); $str = preg_replace($farr,'',$str); return $str; } /** * 过滤接受的参数或者数组,如$_GET,$_POST * @param array|string $arr 接受的参数或者数组 * @return array|string */ static public function filterArr($arr) { if(is_array($arr)){ foreach($arr as $k => $v){ $arr[$k] = self::filterWords($v); } }else{ $arr = self::filterWords($v); } return $arr; } 在防止被注入攻击时，常会用到两个函数：htmlspecialchars()和addslashes() 、trim()函数。这两个函数都是对特殊字符进行转义。1）addslashes()作用及使用addslashes() 通常用于防止sql注入，它可对通过get，post和cookie传递过来的参数的单引号和双引号已经null前加“\”进行转义如：如变量 $str=$_POST["str"];的值为：bb' or 1='1。通过addslashes()函数过滤后会变为：bb\' or 1=\'1；2）htmlspecialchars()作用及使用htmlspecialchars()也是对字符进行转义，与addslashes（）不同的是htmlspecialchars()是将特殊字符用引用实体替换。如alert('xss')通过htmlspecialchars()过滤后为alert('xss')</script>3）addslashes()与htmlspecialchars()的区别除了两个函数的转义方式不同外，它们的使用也不同。addslashes()通过用于防止sql语句注入，在执行sql语句前对通过get、post和cookie传递来的参数中的单引号，双引号，\ 和null进行转义。但sql执行成功后，插入到数据库中的数据是不带有转义字符\的。这是如果插入到数据库中的是一些js脚本，当这些脚本被读取出来时还是会被执行。这是我们可对读取出来的数据使用htmlspecialchars()进行过滤，避免执行被注入的脚本。