* ##安装扩展错误原因及说明： > composer 安装是每个包五分钟超时的。所以请注意了 > * composer install把安装依赖的时间也算进包安装时间了，遇到依赖多的，网络差的，就会出错了。还得重新弄。 > * 如果用composer require，则会把要依赖的包分开下载，这样就会减少很多错误 * ##安装错误： 一般有以下错误。 * php未开启openssl扩展 * 未安装CA证书 **错误详情**  ~~~ PHP Warning: no valid certs found cafile stream: `E:\develop\phpStudy\cert\cacert.pem' in Command line code on line 1 Warning: no valid certs found cafile stream: `E:\develop\phpStudy\cert\cacert.pem' in Command line code on line 1 PHP Warning: copy(): Failed to enable crypto in Command line code on line 1 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 Warning: copy(https://getcomposer.org/installer): failed to open stream: operation failed in Command line code on line ~~~ **解决办法：** 先下载：CA证书下载地址：http://curl.haxx.se/docs/caextract.html 修改php.ini配置，开启openssl扩展 ~~~ ;开启openssl扩展 extension=php_openssl.dll ;配置ca证书地址 openssl.cafile= E:\develop\phpStudy\cert\cacert.pem ~~~ * ##找不到包