setting
browscap = directory/browscap.ini in php.ini doesn't work poc
ini_set('browscap', "~/php_browscap.ini"); doesn't work poc
try custom 
http://www.evanbyrne.com/article/php-browscap
http://alexandre.alapetite.fr/doc-alex/php-local-browscap/index.en.html
google for php setting browscap
CCBot/2.0 (https://commoncrawl.org/faq/)

/usr/lib/php7.2/browscap.ini

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Array
(
    [browser_name_regex] => ~^.*$~
    [browser_name_pattern] => *
    [parent] => DefaultProperties
    [comment] => Default Browser
    [browser] => Default Browser
    [ismobiledevice] => 
    [istablet] => 
    [version] => 0.0
    [platform] => unknown
    [device_type] => unknown
)
3
2
Array
(
    [browser_name_regex] => ~^.*$~
    [browser_name_pattern] => *
    [parent] => DefaultProperties
    [comment] => Default Browser
    [browser] => Default Browser
    [ismobiledevice] => 
    [istablet] => 
    [version] => 0.0
    [platform] => unknown
    [device_type] => unknown
)
3