项目里面常用方法

/**
 * 判断AJAX
 */
function isAjax() {
    if ((isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') && !isset($_GET['ajax'])) {
        return true;
    } else {
        return false;
    }
}

/**
 * 判断GET
 */
function isGet() {
    if ($_SERVER['REQUEST_METHOD'] == 'GET') {
        return true;
    } else {
        return false;
    }
}

/**
 * 判断POST
 */
function isPost() {
    if ($_SERVER['REQUEST_METHOD'] == 'POST') {
        return true;
    } else {
        return false;
    }
}

/**
 * 判断微信访问
 * @return bool
 */
function isWechat() {
    if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false) {
        return true;
    }

    return false;
}

/**
 * 判断APP访问
 * @return bool
 */
function isApp() {
    if ($_SERVER['HTTP_FROM'] == 'app') {
        return true;
    } else {
        return false;
    }
}
/**
 * 数据签名
 * @param $data
 * @return mixed
 */
function data_sign($data) {
    $config = Config::get('dux.use');
    if (!is_array($data)) {
        $data = [
            'data' => $data
        ];
    }
    ksort($data);
    return base64_encode(hash_hmac('sha1', http_build_query($data), $config['safe_key'], true));
}

/**
 * 验证签名
 * @param $data
 * @param string $sign
 * @return bool
 */
function data_sign_has($data, $sign = '') {
    if(empty($sign)) {
        return false;
    }
    if (!is_array($data)) {
        $data = [
            'data' => $data
        ];
    }
    $sign = base64_decode($sign);
    ksort($data);
    $config = Config::get('dux.use');
    $valToken = hash_hmac('sha1', http_build_query($data), $config['safe_key'], true);
    return ($sign == $valToken);
}
/**
 * 时间格式化
 * @param $time
 * @return string
 */
function date_tran($time) {
    $agoTime = (int)$time;

    // 计算出当前日期时间到之前的日期时间的毫秒数，以便进行下一步的计算
    $time = time() - $agoTime;

    if ($time >= 31104000) { // N年前
        $num = (int)($time / 31104000);

        return $num . '年前';
    }
    if ($time >= 2592000) { // N月前
        $num = (int)($time / 2592000);

        return $num . '月前';
    }
    if ($time >= 86400) { // N天前
        $num = (int)($time / 86400);

        return $num . '天前';
    }
    if ($time >= 3600) { // N小时前
        $num = (int)($time / 3600);

        return $num . '小时前';
    }
    if ($time > 60) { // N分钟前
        $num = (int)($time / 60);

        return $num . '分钟前';
    }

    return '刚刚';
}
 /**
     * 判断UTF-8
     * @param  string $string 字符串
     * @return boolean
     */
    public static function isUtf8($string) {
        if (!empty($string)) {
            $ret = json_encode(['code' => $string]);
            if ($ret == '{"code":null}') {
                return false;
            }
        }

        return true;
    }

    /**
     * 转义html
     * @param $str
     * @return string
     */
    public static function htmlIn($str) {
        if (function_exists('htmlspecialchars')) {
            $str = htmlspecialchars($str);
        } else {
            $str = htmlentities($str);
        }
        $str = addslashes($str);

        return $str;
    }

    /**
     * html代码还原
     * @param $str
     * @return string
     */
    public static function htmlOut($str) {
        if (function_exists('htmlspecialchars_decode')) {
            $str = htmlspecialchars_decode($str);
        } else {
            $str = html_entity_decode($str);
        }
        $str = stripslashes($str);

        return $str;
    }

    /**
     * html代码清理
     * @param $str
     * @return string
     */
    public static function htmlClear($str) {
        $str = self::htmlOut($str);
        $xss = new duxvendorHtmlCleaner();

        return $xss->remove($str);
    }

    /**
     * 符号过滤
     * @param $text
     * @return string
     */
    public static function symbolClear($text) {
        if (trim($text) == '') return '';
        $text = preg_replace("/[[:punct:]s]/", ' ', $text);
        $text = urlencode($text);
        $text = preg_replace("/(%7E|%60|%21|%40|%23|%24|%25|%5E|%26|%27|%2A|%28|%29|%2B|%7C|%5C|%3D|-|_|%5B|%5D|%7D|%7B|%3B|%22|%3A|%3F|%3E|%3C|%2C|.|%2F|%A3%BF|%A1%B7|%A1%B6|%A1%A2|%A1%A3|%A3%AC|%7D|%A1%B0|%A3%BA|%A3%BB|%A1%AE|%A1%AF|%A1%B1|%A3%FC|%A3%BD|%A1%AA|%A3%A9|%A3%A8|%A1%AD|%A3%A4|%A1%A4|%A3%A1|%E3%80%82|%EF%BC%81|%EF%BC%8C|%EF%BC%9B|%EF%BC%9F|%EF%BC%9A|%E3%80%81|%E2%80%A6%E2%80%A6|%E2%80%9D|%E2%80%9C|%E2%80%98|%E2%80%99|%EF%BD%9E|%EF%BC%8E|%EF%BC%88)+/", ' ', $text);
        $text = urldecode($text);

        return trim($text);
    }

    /**
     * 随机字符串
     * @param int $length
     * @return string
     */
    public static function randStr($length = 5) {
        $pattern = '1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLOMNOPQRSTUVWXYZ';
        $key = '';
        for ($i = 0; $i < $length; $i++) {
            $key .= $pattern{mt_rand(0, 35)};
        }

        return $key;
    }

/**
 * 格式化为数字(忽略限制)
 * @param $str
 * @return int|mixed
 */
public static function intFormat($str) {
        $str = preg_replace('/[^-d]*(-?d*).*/', '$1', $str);
        return $str ? $str : 0;
}  
/**
 * 价格格式化不带千分位
 * @param $money
 * @return string
 */
public static function priceFormat($str) {
        if (empty($str)) {
            return $str = 0;
        }

        return @number_format($str, 2, ".", "");
}
/**
     * CURL POST数据
     * @param  string  $url       发送地址
     * @param  array   $post_data 发送数组
     * @param  integer $timeout   超时秒
     * @param  string  $header    头信息
     * @return string
     */
    static public function curlPost($url, $post_data=array(), $timeout=5,$header="") {
        $header=empty($header)?'':$header;
        $post_string = http_build_query($post_data);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_string);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_REFERER, $_SERVER['HTTP_HOST']);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array($header));//模拟的header头
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
}
/**
     * CURL POST数据
     * @param  string  $url       发送地址
     * @param  array   $post_data 发送数组
     * @param  integer $timeout   超时秒
     * @param  string  $header    头信息
     * @return string
     */
    static public function curlPost($url, $post_data=array(), $timeout=5,$header="") {
        $header=empty($header)?'':$header;
        $post_string = http_build_query($post_data);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_string);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_REFERER, $_SERVER['HTTP_HOST']);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array($header));//模拟的header头
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
}
/**
     * 获取客户端系统语言
     * @access public
     * @static true
     * @return string
     */
    public static function getUserLang() {
        return htmlspecialchars($_SERVER['HTTP_ACCEPT_LANGUAGE']);
    }

    /**
     * 获取客户端IP
     *
     * @access public
     * @return string
     */
    public static function getUserIp() {
        return htmlspecialchars($_SERVER['REMOTE_ADDR']);
    }

    /**
     * 获取当前页面的url来源
     *
     * @access public
     * @return string
     */
    public static function getUrlSource() {
        return htmlspecialchars($_SERVER['HTTP_REFERER']);
    }

    /**
     * 获取客户端浏览器信息.
     *
     * @access public
     * @return string
     */
    public static function getUserAgent() {
        return htmlspecialchars($_SERVER['HTTP_USER_AGENT']);
    }

    /**
     * 获取客户端浏览器信息
     *
     * @access public
     * @return string
     */
    public static function getUserBrowser() {
        $userAgentInfo = htmlspecialchars($_SERVER['HTTP_USER_AGENT']);

        if (strpos($userAgentInfo, 'MSIE 9.0')) {
            return 'IE9';
        } else if (strpos($userAgentInfo, 'MSIE 8.0')) {
            return 'IE8';
        } else if (strpos($userAgentInfo, 'MSIE 7.0')) {
            return 'IE7';
        } else if (strpos($userAgentInfo, 'MSIE 6.0')) {
            return 'IE6';
        } else if (strpos($userAgentInfo, 'Firefox')) {
            return 'Firfox';
        } else if (strpos($userAgentInfo, 'Chrome')) {
            return 'Chrome';
        } else if (strpos($userAgentInfo, 'Opera')) {
            return 'Opera';
        } else if (strpos($userAgentInfo, 'Safari')) {
            return 'Safari';
        } else if (strpos($userAgentInfo, 'Elinks')) {
            return 'Elinks';
        } else if (strpos($userAgentInfo, 'OmniWeb')) {
            return 'OmniWeb';
        } else if (strpos($userAgentInfo, 'Links')) {
            return 'Links';
        } else if (strpos($userAgentInfo, 'Lynx')) {
            return 'Lynx';
        } else if (strpos($userAgentInfo, 'Arora')) {
            return 'Arora';
        } else if (strpos($userAgentInfo, 'Epiphany')) {
            return 'Epiphany';
        } else if (strpos($userAgentInfo, 'Konqueror')) {
            return 'Konqueror';
        } else if (strpos($userAgentInfo, 'EudoraWeb')) {
            return 'EudoraWeb';
        } else if (strpos($userAgentInfo, 'Minimo')) {
            return 'Minimo';
        } else if (strpos($userAgentInfo, 'NetFront')) {
            return 'NetFront';
        } else if (strpos($userAgentInfo, 'POLARIS')) {
            return 'Polaris';
        } else if (strpos($userAgentInfo, 'BlackBerry')) {
            return 'BlackBerry';
        } else if (strpos($userAgentInfo, 'Nokia')) {
            return 'Nokia';
        } else {
            return 'Others';
        }
    }

    /**
     * 获取客户端操作系统信息     *
     * @access public
     * @return string
     */
    public static function getUserOs() {
        $userAgentInfo = htmlspecialchars($_SERVER['HTTP_USER_AGENT']);
        if (strpos($userAgentInfo, 'Windows NT 6.1')) {
            return 'Windows 7';
        } else if (strpos($userAgentInfo, 'Windows NT 6.0')) {
            return 'Windows Vista';
        } else if (strpos($userAgentInfo, 'Windows NT 5.2')) {
            return 'Windows 2003';
        } else if (strpos($userAgentInfo, 'Windows NT 5.1')) {
            return 'Windows XP';
        } else if (strpos($userAgentInfo, 'Windows NT 5.0')) {
            return 'Windows 2000';
        } else if (strpos($userAgentInfo, 'Windows ME')) {
            return 'Windows ME';
        } else if (strpos($userAgentInfo, 'PPC Mac OS X')) {
            return 'OS X PPC';
        } else if (strpos($userAgentInfo, 'Intel Mac OS X')) {
            return 'OS X Intel';
        } else if (strpos($userAgentInfo, 'Win98')) {
            return 'Windows 98';
        } else if (strpos($userAgentInfo, 'Win95')) {
            return 'Windows 95';
        } else if (strpos($userAgentInfo, 'WinNT4.0')) {
            return 'Windows NT4.0';
        } else if (strpos($userAgentInfo, 'Mac OS X Mach-O')) {
            return 'OS X Mach';
        } else if (strpos($userAgentInfo, 'Ubuntu')) {
            return 'Ubuntu';
        } else if (strpos($userAgentInfo, 'Debian')) {
            return 'Debian';
        } else if (strpos($userAgentInfo, 'AppleWebKit')) {
            return 'WebKit';
        } else if (strpos($userAgentInfo, 'Mint/8')) {
            return 'Mint 8';
        } else if (strpos($userAgentInfo, 'Minefield')) {
            return 'Minefield Alpha';
        } else if (strpos($userAgentInfo, 'gentoo')) {
            return 'Gentoo';
        } else if (strpos($userAgentInfo, 'Kubuntu')) {
            return 'Kubuntu';
        } else if (strpos($userAgentInfo, 'Slackware/13.0')) {
            return 'Slackware 13';
        } else if (strpos($userAgentInfo, 'Fedora')) {
            return 'Fedora';
        } else if (strpos($userAgentInfo, 'FreeBSD')) {
            return 'FreeBSD';
        } else if (strpos($userAgentInfo, 'SunOS')) {
            return 'SunOS';
        } else if (strpos($userAgentInfo, 'OpenBSD')) {
            return 'OpenBSD';
        } else if (strpos($userAgentInfo, 'NetBSD')) {
            return 'NetBSD';
        } else if (strpos($userAgentInfo, 'DragonFly')) {
            return 'DragonFly';
        } else if (strpos($userAgentInfo, 'IRIX')) {
            return 'IRIX';
        } else if (strpos($userAgentInfo, 'Windows CE')) {
            return 'Windows CE';
        } else if (strpos($userAgentInfo, 'PalmOS')) {
            return 'PalmOS';
        } else if (strpos($userAgentInfo, 'Linux')) {
            return 'Linux';
        } else if (strpos($userAgentInfo, 'DragonFly')) {
            return 'DragonFly';
        } else if (strpos($userAgentInfo, 'Android')) {
            return 'Android';
        } else if (strpos($userAgentInfo, 'Mac OS X')) {
            return 'Mac OS X';
        } else if (strpos($userAgentInfo, 'iPhone')) {
            return 'iPhone OS';
        } else if (strpos($userAgentInfo, 'Symbian OS')) {
            return 'Symbian';
        } else if (strpos($userAgentInfo, 'Symbian OS')) {
            return 'Symbian';
        } else if (strpos($userAgentInfo, 'SymbianOS')) {
            return 'SymbianOS';
        } else if (strpos($userAgentInfo, 'webOS')) {
            return 'webOS';
        } else if (strpos($userAgentInfo, 'PalmSource')) {
            return 'PalmSource';
        } else {
            return 'Others';
        }
    }

/**
     * 字符串截取
     * @param $str
     * @param $length
     * @param bool $suffix
     * @param string $charset
     * @return string
     */
    public static function strLen($str, $length, $suffix = true, $charset = "utf-8") {
        if ($charset != 'utf-8') {
            $str = mb_convert_encoding($str, 'utf8', $charset);
        }
        $osLen = mb_strlen($str);
        if ($osLen <= $length) {
            return $str;
        }
        $string = mb_substr($str, 0, $length, 'utf8');
        $sLen = mb_strlen($string, 'utf8');
        $bLen = strlen($string);
        $sCharCount = (3 * $sLen - $bLen) / 2;
        if ($osLen <= $sCharCount + $length) {
            $arr = preg_split('/(?<!^)(?!$)/u', mb_substr($str, $length + 1, $osLen, 'utf8')); //将中英混合字符串分割成数组（UTF8下有效）
        } else {
            $arr = preg_split('/(?<!^)(?!$)/u', mb_substr($str, $length + 1, $sCharCount, 'utf8'));
        }
        foreach ($arr as $value) {
            if (ord($value) < 128 && ord($value) > 0) {
                $sCharCount = $sCharCount - 1;
            } else {
                $sCharCount = $sCharCount - 2;
            }
            if ($sCharCount <= 0) {
                break;
            }
            $string .= $value;
        }
        if ($suffix) return $string . '…';

        return $string;
    }