前段时间把服务器的 OpenSSL 升级了到 1.1.1c 版本，今天安装 Composer 的时候报错了！
报错的指令为：
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
PHP 的错误日志记录如下：
PHP Warning: copy(): SSL operation failed with code 1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed in Command line code on line 1
PHP Warning: copy(): Failed to enable crypto in Command line code on line 1
PHP Warning: copy(https://getcomposer.org/installer): failed to open stream: operation failed in Command line code on line 1
经检查，报错是因为无法验证 CA 证书。
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