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 (http://commoncrawl.org/faq/)

/usr/lib/php5.6/browscap.ini

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