composer 版本号中的 ^ circumflex accent/脱字号/扬抑符是什么意思?-PHP Tutorial-php.cn

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composer 版本号中的 ^ circumflex accent/脱字号/扬抑符是什么意思?

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Jun 06, 2016 pm 08:29 PM

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在使用 composer mailgun 的时候遇到的
"mailgun/mailgun-php": "^1.8"

以前遇到过 ^ 这个符号, 但都没深究. 现在通过搜索找不到答案.

这里(http://docs.phpcomposer.com/01-basic-usage.html)说了 ~ 的作用, 但是没讲 ^.

找到 ^ 的几种叫法:

circumflex accent
脱字号
扬抑符(在维基百科之外的一些地方也统称为抑扬符)

但不知道这个符号的作用. 尤其是在软件版本号上的作用.

请教.

回复内容：

在使用 composer mailgun 的时候遇到的
"mailgun/mailgun-php": "^1.8"

以前遇到过 ^ 这个符号, 但都没深究. 现在通过搜索找不到答案.

这里(http://docs.phpcomposer.com/01-basic-usage.html)说了 ~ 的作用, 但是没讲 ^.

找到 ^ 的几种叫法:

circumflex accent
脱字号
扬抑符(在维基百科之外的一些地方也统称为抑扬符)

但不知道这个符号的作用. 尤其是在软件版本号上的作用.

请教.

是控制版本用的
详细解释如下:
https://getcomposer.org/doc/articles/versions.md#caret
例子:
^1.2.3 表示 >=1.2.3 ^0.3 表示 >=0.3.0

首先猜测是跟正则的符号一样，表示match beginning of 1.8

具体我来找找。。。猜测错误

======================请看楼下=============================

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