php7.1, the .so file has been generated, and the extension has been added to php.ini. When php-fpm restarts, an error message /usr/local/php/bin/php: symbol lookup error: /usr/local/php/ lib/php/extensions/no-debug-non-zts-20160303/openssl.so: undefined symbol: OPENSSL_init_ssl
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Look at the error message! symbol is undefined