SSL例程：tls_process_server_certificate：证书验证失败未能启用加密

Question

当我尝试在系统上安装Composer时，总是会出现此错误

    The "https://getcomposer.org/versions" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
Failed to enable crypto
failed to open stream: operation failed

我使用了php -r'print_r（openssl_get_cert_locations（））;'命令查看php默认证书位置，结果如下：

    Array
(
    [default_cert_file] => C:\usr\local\ssl/cert.pem
    [default_cert_file_env] => SSL_CERT_FILE
    [default_cert_dir] => C:\usr\local\ssl/certs
    [default_cert_dir_env] => SSL_CERT_DIR
    [default_private_dir] => C:\usr\local\ssl/private
    [default_default_cert_area] => C:\usr\local\ssl
    [ini_cafile] => C:\xampp\apache\cert.pem
    [ini_capath] =>
)

C：\ usr \ local \ ssl / cert.pem不存在，因此我从http://curl.haxx.se/ca/cacert.pem下载了ssl证书并手动创建了C：\ usr \ local \ ssl / cert.pem，但仍然没有成功。 我真的需要一个解决方案，因为我没有选择权，或者有没有办法可以绕过ssl证书验证。