刚开始提示安装composer curl -sS https://getcomposer.org/installer | php php composer.phar install ssh 输入命令后提示函数被禁用 [ErrorException] putenv() has been disabled for security reasons 解除禁用继续php composer.phar install 提示 [Symfony\Component\Process\Exception\RuntimeException] The Process class relies on proc_open, which is not available on your