windows下 composer常见错误及处理。
错误一：
Warning: This development build of composer is over 30 days old. It is recommend
ed to update it by running “C:\ProgramData\ComposerSetup\bin\composer.phar self-
update” to get the latest version.
解决方法：
composer selfupdate
错误二：
You are running composer with xdebug enabled. This has a major impact on runtime
performance. See https://getcomposer.org/xdebug
解决方法：
打开php.ini，在zend_extension前加分号
;zend_extension = “d:/wamp/bin/php/php5.5.12/zend_ext/php_xdebug-2.2.5-5.5-vc11-x86_64.dll”
见文档：
https://getcomposer.org/doc/articles/troubleshooting.md#xdebug-impact-on-composer
错误三：
Fatal error: Call to undefined method Fxp\Composer\AssetPlugin\Package\Version\V
ersionParser::parseLinks() in C:\Documents and Settings\Administrator\Applicatio
n Data\Composer\vendor\fxp\composer-asset-plugin\Repository\VcsPackageFilter.php
on line 272
解决办法：
删除composer资源插件，再重新安装
Linux : rm -rf ~/.composer/vendor/fxp
Windows : rm -r %APPDATA%\Composer\vendor\fxp
重新安装：
composer global require “fxp/composer-asset-plugin:~1.0.3”
如果还有其它错误，可尝试全局更新：
composer global update
见参考：
http://stackoverflow.com/questions/32901750/why-do-i-get-php-fatal-error-when-i-want-to-install-an-extension
错误四：
The “yiisoft/yii2-composer” plugin requires composer-plugin-api 1.0.0, this *WIL L* break in the future and it should be fixed ASAP (require ^1.0 for example). The “fxp/composer-asset-plugin” plugin requires composer-plugin-api 1.0.0, this*WILL* break in the future and it should be fixed ASAP (require ^1.0 for example ).
解决办法：
Yii2 需要 composer-plugin-api 1.0 以上的版本，运行以下命令：
composer global require “fxp/composer-asset-plugin:~1.1.1”
更多信息参考：
composer 中文网：http://www.phpcomposer.com/
composer官网：https://getcomposer.org/doc/
