Composer設置忽略版本匹配的方法

Composer簡介

Composer 是 PHP 的一個依賴管理工具。它容許你申明項目所依賴的代碼庫，它會在你的項目中爲你安裝他們。Composer 不是一個包管理器。是的，它涉及 "packages" 和 "libraries"，但它在每一個項目的基礎上進行管理，在你項目的某個目錄中（例如 vendor）進行安裝。默認狀況下它不會在全局安裝任何東西。所以，這僅僅是一個依賴管理。

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

完整錯誤以下：

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1 2 3 4 5 6 7 8 9 10 11

vagrant@homestead:/usr/share/nginx/html/laravel-blog$ sudo composer install Loading composer repositories with package information Installing dependencies (including require -dev) from lock file Your requirements could not be resolved to an installable set of packages. Problem 1 - Installation request for doctrine/instantiator 1.0.3 -> satisfiable by doctrine/instantiator[1.0.3]. - doctrine/instantiator 1.0.3 requires php ~5.3 -> your PHP version (7.0.3) does not satisfy that requirement. Problem 2 - doctrine/instantiator 1.0.3 requires php ~5.3 -> your PHP version (7.0.3) does not satisfy that requirement. - phpunit/phpunit-mock-objects 2.3.0 requires doctrine/instantiator ~1.0,>=1.0.1 -> satisfiable by doctrine/instantiator[1.0.3]. - Installation request for phpunit/phpunit-mock-objects 2.3.0 -> satisfiable by phpunit/phpunit-mock-objects[2.3.0].

提示個人PHP 7版本過高，不符合composer.json須要的版本，可是在PHP 7下應該也是能夠運行的，composer能夠設置忽略版本匹配，命令是：

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1	composer install --ignore-platform-reqs

or

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1	composer update --ignore-platform-reqs

再次執行composer命令能夠正常安裝包了。

若是提示警告：

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1 2	Cannot create cache directory /home/vagrant/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache Cannot create cache directory /home/vagrant/.composer/cache/files/, or directory is not writable. Proceeding without cache

這是在虛擬機中執行composer，提示這個目錄沒有可寫權限，composer沒法緩存下載的包，這樣就每次都得從新下載，把目錄改爲可寫可讀便可。

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

另外，在虛擬機中也設置composer爲國內鏡像，否則下載速度慢的要死，執行：

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1	composer config -g repo.packagist composer https: //packagist.phpcomposer.com

OK，大功告成。