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composer 版本下载问题：这个^ 是什么意思？
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- 2016-06-06 20:07:40949browse
回复内容：
参考 https://getcomposer.org/doc/articles/versions.md#caret
跟正则表达式的^一个意思
~2.8 相当于 >=2.8,
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