几个从discuz剥离的函数

2、获取浏览者IP,从DZ剥离
//获得当前浏览者IP
//$ip = getenv(‘REMOTE_ADDR’);
if(getenv(‘HTTP_CLIENT_IP’) && strcasecmp(getenv(‘HTTP_CLIENT_IP’), ‘unknown’)) {
    $onlineip = getenv(‘HTTP_CLIENT_IP’);
} elseif(getenv(‘HTTP_X_FORWARDED_FOR’) && strcasecmp(getenv(‘HTTP_X_FORWARDED_FOR’), ‘unknown’)) {
    $onlineip = getenv(‘HTTP_X_FORWARDED_FOR’);
} elseif(getenv(‘REMOTE_ADDR’) && strcasecmp(getenv(‘REMOTE_ADDR’), ‘unknown’)) {
    $onlineip = getenv(‘REMOTE_ADDR’);
} elseif(isset($_SERVER[‘REMOTE_ADDR’]) && $_SERVER[‘REMOTE_ADDR’] && strcasecmp($_SERVER[‘REMOTE_ADDR’], ‘unknown’)) {
    $onlineip = $_SERVER[‘REMOTE_ADDR’];
}

//看看ip是不是点分段，7-15个数字之间，用到了一个正则表达式
preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
$onlineip = $onlineipmatches[0] ? $onlineipmatches[0] : ‘unknown’;

3、验证邮箱
function isemail($email) {
    return strlen($email) > 6 && preg_match("/^[\w\-\.]+@[\w\-\.]+(\.\w+)+$/", $email);
}

4、过滤危险html代码
function dhtmlspecialchars($string) {
    if(is_array($string)) {
        foreach($string as $key => $val) {
            $string[$key] = dhtmlspecialchars($val);
        }
    } else {
        $string = preg_replace(‘/&((#(\d{3,5}|x[a-fA-F0-9]{4}));)/’, ‘&\\1’,
        //$string = preg_replace(‘/&((#(\d{3,5}|x[a-fA-F0-9]{4})|[a-zA-Z][a-z0-9]{2,5});)/’, ‘&\\1’,
        str_replace(array(‘&’, ‘"’, ‘<‘, ‘>’), array(‘&’, ‘"’, ‘<‘, ‘>’), $string));
    }
    return $string;
}

5、sql防注入
$magic_quotes_gpc = get_magic_quotes_gpc();
@extract(daddslashes($_COOKIE));
@extract(daddslashes($_POST));
@extract(daddslashes($_GET));
if(!$magic_quotes_gpc) {
$_FILES = daddslashes($_FILES);
}

function daddslashes($string, $force = 0) {
if(!$GLOBALS[‘magic_quotes_gpc’] || $force) {
if(is_array($string)) {
foreach($string as $key => $val) {
$string[$key] = daddslashes($val, $force);
}
} else {
$string = addslashes($string);
}
}
return $string;
}