關於Composer常見錯誤及其解決辦法

Composer常見錯誤解決方案

執行composer install遇到錯誤：Your requirements could not be resolved to an installable set of packages. 這是因為不匹配composer.json要求的版本。

完整錯誤如下：

vagrant@homestead:/usr/share/nginx/html/laravel-blog$ sudocomposerinstall
Loadingcomposerrepositorieswithpackage information
Installingdependencies (includingrequire-dev) fromlockfile
Yourrequirementscouldnot beresolvedto aninstallablesetofpackages.
  
  Problem 1
    - Installationrequestfor doctrine/instantiator 1.0.3 -> satisfiablebydoctrine/instantiator[1.0.3].
    - doctrine/instantiator 1.0.3 requiresphp ~5.3 -> yourPHPversion (7.0.3) doesnot satisfythatrequirement.
  Problem 2
    - doctrine/instantiator 1.0.3 requiresphp ~5.3 -> yourPHPversion (7.0.3) doesnot satisfythatrequirement.
    - phpunit/phpunit-mock-objects 2.3.0 requiresdoctrine/instantiator ~1.0,>=1.0.1 -> satisfiablebydoctrine/instantiator[1.0.3].
    - Installationrequestfor phpunit/phpunit-mock-objects 2.3.0 -> satisfiablebyphpunit/phpunit-mock-objects[2.3.0].

提示我的PHP 7版本太高，不符合composer.json需要的版本，但是在PHP 7下應該也是可以執行的，composer可以設定忽略版本匹配，命令是：

composerinstall --ignore-platform-reqs

或者

composerupdate --ignore-platform-reqs

再次執行composer命令可以正常安裝包了。

如果提示警告：

Cannotcreatecachedirectory /home/vagrant/.composer/cache/repo/https---packagist.org/, or directoryis not writable. Proceedingwithoutcache
  Cannotcreatecachedirectory /home/vagrant/.composer/cache/files/, or directoryis not writable. Proceedingwithoutcache

這是在虛擬機器器中執行composer，提示這個目錄沒有可寫許可權，composer無法快取下載的包，這樣就每次都得重新下載，把目錄改成可寫可讀即可。

sudo chmod -R 777 /home/vagrant/.composer/cache/files/

另外，在虛擬機器器中也設定composer為國內映象，不然下載速度慢的要死，執行：

composerconfig -g repo.packagistcomposerhttps://packagist.phpcomposer.com

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