邮箱验证

function is_valid_email($email) {
    if (preg_match('/^[\w\-\.]+@[\w\-\.]+(\.\w+)+$/', $email)) {
        return true;
    } else {
        return false;
    }
}

301跳转

function redirect($url) {
    header('location:'.$url, false, 301);
    exit;
}

获取客户端IP

function real_ip($type = 0)
{
    $ip = $_SERVER['REMOTE_ADDR'];
    if ($type <= 0 && isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
        foreach ($matches[0] as $xip) {
            if (filter_var($xip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
                $ip = $xip;
                break;
            }
        }
    } elseif ($type <= 0 && isset($_SERVER['HTTP_CLIENT_IP']) && filter_var($_SERVER['HTTP_CLIENT_IP'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif ($type <= 1 && isset($_SERVER['HTTP_CF_CONNECTING_IP']) && filter_var($_SERVER['HTTP_CF_CONNECTING_IP'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
        $ip = $_SERVER['HTTP_CF_CONNECTING_IP'];
    } elseif ($type <= 1 && isset($_SERVER['HTTP_X_REAL_IP']) && filter_var($_SERVER['HTTP_X_REAL_IP'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
        $ip = $_SERVER['HTTP_X_REAL_IP'];
    }
    return $ip;
}

取中间文本

function getSubstr($str, $leftStr, $rightStr)
{
    $left = strpos($str, $leftStr);
    $right = strpos($str, $rightStr, $left);
    if ($left < 0) return '';
    if ($right > 0) {
        return substr($str, $left + strlen($leftStr), $right - $left - strlen($leftStr));
    } else {
        return substr($str, $left + strlen($leftStr));
    }
}

是否HTTPS访问

function is_https()
{
    if (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
        return true;
    } elseif (isset($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS']) == 'on' || $server['HTTPS'] == '1')) {
        return true;
    } elseif (isset($_SERVER['HTTP_X_CLIENT_SCHEME']) && $_SERVER['HTTP_X_CLIENT_SCHEME'] == 'https') {
        return true;
    } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
        return true;
    } elseif (isset($_SERVER['REQUEST_SCHEME']) && $_SERVER['REQUEST_SCHEME'] == 'https') {
        return true;
    } elseif (isset($_SERVER['HTTP_EWS_CUSTOME_SCHEME']) && $_SERVER['HTTP_EWS_CUSTOME_SCHEME'] == 'https') {
        return true;
    }
    return false;
}

随机IP

function randIp()
{
    return mt_rand(0, 255) . '.' . mt_rand(0, 255) . '.' . mt_rand(0, 255) . '.' . mt_rand(0, 255);
}

毫秒时间戳

function msectime() {
    list($msec, $sec) = explode(' ', microtime());
    return (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
}

获取重定向地址

function getrealurl($url){
    @$header = get_headers($url,1);
    if (strpos($header[0],'301') || strpos($header[0],'302')) {
        if(is_array($header['Location'])) {
            return $header['Location'][count($header['Location'])-1];
        }else{
            return $header['Location'];
        }
    }else {
        return $url;
    }
}

jsonp转数组

function jsonp_decode($jsonp, $assoc = false)
{
    $jsonp = trim($jsonp);
    if (isset($jsonp[0]) && $jsonp[0] !== '[' && $jsonp[0] !== '{') {
        $begin = strpos($jsonp, '(');
        if (false !== $begin) {
            $end = strrpos($jsonp, ')');
            if (false !== $end) {
                $jsonp = substr($jsonp, $begin + 1, $end - $begin - 1);
            }
        }
    }
    return json_decode($jsonp, $assoc);
}