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Cannot determine required PHP extensions: Warning: is_dir(): open_basedir restriction in effect. File(/etc/pki/tls/certs) is not within the allowed path(s): (/home/sanikala/:/tmp:/var/tmp:/usr/local/lib/php/:/usr/local/php56/lib/php/) in /home/sanikala/domains/sanikala.com/public_html/vendor/composer/composer/src/Composer/Util/RemoteFilesystem.php on line 914

这个问题最模板检查排除之后，原来是magento2默认安装是必须存在SSL的，但是我们默认是未有ssl在，所以可以在文件屏蔽该检测。

找到文件composer.json

在23行，找到