在使用最新版 Composer 安装 Laravel 的时候，你可能会遇到下面的问题而安装失败：
$ php composer.phar create-project --prefer-dist laravel/laravel blogInstalling laravel/laravel (v5.2.15) - Installing laravel/laravel (v5.2.15) Loading from cacheCreated project in blog> php -r "copy('.env.example', '.env');"> php artisan clear-compiledPHP Warning: require(/home/vagrant/laraveltest/blog/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /home/vagrant/laraveltest/blog/bootstrap/autoload.php on line 17PHP Fatal error: require(): Failed opening required '/home/vagrant/laraveltest/blog/bootstrap/../vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /home/vagrant/laraveltest/blog/bootstrap/autoload.php on line 17Script php artisan clear-compiled handling the pre-update-cmd event returned with an error [RuntimeException] Error Output: PHP Warning: require(/home/vagrant/laraveltest/blog/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /home/vagrant/laraveltest/bl og/bootstrap/autoload.php on line 17 PHP Fatal error: require(): Failed opening required '/home/vagrant/laraveltest/blog/bootstrap/../vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /home/vagr ant/laraveltest/blog/bootstrap/autoload.php on line 17 create-project [-s|--stability STABILITY] [--prefer-source] [--prefer-dist] [--repository REPOSITORY] [--repository-url REPOSITORY-URL] [--dev] [--no-dev] [--no-plugins] [--no-custom-installers] [--no-scripts] [--no-progress] [--keep-vcs] [--no-install] [--ignore-platform-reqs] [--] [<package>] [<directory>] [<version>] 这是由于 Composer 最近更新了 pre-update-command的工作方式，而这会使得 Laravel 安装失败。
@ Jordi Boggiano给出的 原因如下：
这是由于缺少 composer.lock文件，因此最初的 install命令被 update操作替代，因为它会触发 pre-update-cmd，而在这之前是触发的 pre-install-cmd。
幸运的是，修复这个问题非常简单，只需要把 php artisan clear-compiled移动到 post-update-command即可：
这里是完整的 ChangeLog。
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