PECL install报错Unable to find the socket transport "ssl"

报错信息

D:\pear>pecl install grpc-beta
WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update Could not download from "https://pecl.php.net/get/grpc-1.22.0.tgz", cannot download "pecl/grpc" (Connection to `ssl://pecl.php.net:443' failed: Unable to find the socket transport "ssl" - did you forget to enable it when you configured PHP?)
Error: cannot download "pecl/grpc"
Download failed
install failed

解决办法

D:\pear>pecl channel-update pecl.php.net
Updating channel "pecl.php.net"
Update of Channel "pecl.php.net" succeeded

安装过程

D:\pear>php -r "print_r(openssl_get_cert_locations());"
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] => D:\Apache24\conf\cacert.pem
    [ini_capath] =>
)

D:\pear>pecl channel-update pecl.php.net
Updating channel "pecl.php.net"
Update of Channel "pecl.php.net" succeeded

D:\pear>php -r "print_r(openssl_get_cert_locations());"
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] => D:\Apache24\conf\cacert.pem
    [ini_capath] =>
)

D:\pear>