以下这个错误是由于在使用 Composer 下载依赖包时,遇到了 SSL 证书问题。具体来说,Composer 在尝试从 https://repo.packagist.org 下载 topthink/think-installer.json 文件时,遇到了一个自签名证书(self-signed certificate),导致 SSL 验证失败。[ComposerDownloaderTransportException (100)]curl error 60 while downloading https://repo.packagist.org/p2/topthink/think-installer.json: SSL certificate problem: self signed certificate in certificate chain