pkg command

I have a php script and whenever I run it, I get the following error message in my log file:
     2017/02/05 23:25:46 [error] 9696#9696: *10 FastCGI sent in stderr: “PHP message: PHP Fatal error: Call to undefined function gzinflate() in /home/xxxx/http/includes/functions.php(1) : eval()’d code on line 1″ while reading response header from upstream, client:, server:, request: “GET /a/ HTTP/1.0”, upstream: “fastcgi://”, host: “”
How do I fix this problem on Alpine Linux or Unix operating systems?
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