PHP 通过get_browser取流览器信息

/**
 * Tells what the user's browser is capable of
 * @link https://php.net/manual/en/function.get-browser.php
 * @param string $user_agent [optional] <p>
 * The User Agent to be analyzed. By default, the value of HTTP
 * User-Agent header is used; however, you can alter this (i.e., look up
 * another browser's info) by passing this parameter.
 * </p>
 * <p>
 * You can bypass this parameter with a &null; value.
 * </p>
 * @param bool $return_array [optional] <p>
 * If set to true, this function will return an array
 * instead of an object.
 * </p>
 * @return array|object|false Returns false if browscap.ini can't be loaded or the user agent can't be found, otherwise the information is returned in an object or an array which will contain
 * various data elements representing, for instance, the browser's major and
 * minor version numbers and ID string; true/false values for features
 * such as frames, JavaScript, and cookies; and so forth.
 * </p>
 * <p>
 * The cookies value simply means that the browser
 * itself is capable of accepting cookies and does not mean the user has
 * enabled the browser to accept cookies or not. The only way to test if
 * cookies are accepted is to set one with setcookie,
 * reload, and check for the value.
 * @since 4.0
 * @since 5.0
 */
function get_browser ($user_agent = null, $return_array = null) {}

PHP默认是没有browscap.ini这个配置文件的。需要自己下载安装：

下载地址：http://browscap.org/

这个配置项在php.ini中，查看PHP使用的ini文件位置：

php --ini

打开php.ini文件，找到这个地方

[browscap]
; http://php.net/browscap
;browscap = extra/browscap.ini
browscap = /usr/local/etc/php/7.1/php_browscap.ini

将下载的php_browscap.ini放到php目录下，或是其它地方也可以。将文件地址添加到php.ini中。注意：需要添加文件的绝对路径，否则可能不生效。。配置好后，重启php-fpm就可以了。