composer ^ 這個符號什麼意思不太明白？

這是官網的話
Caret#

The ^ operator behaves very similarly but it sticks closer to semantic versioning, and will always allow non-breaking updates. For example ^1.2.3 is equivalent to >=1.2.3 <2.0.0 as none of the releases until 2.0 should break backwards compatibility. For pre-1.0 versions it also acts with safety in mind and treats ^0.3 as >=0.3.0 <0.4.0.

This is the recommended operator for maximum interoperability when writing library code.

Example: ^1.2.3
Composer

回複內容：

這是官網的話
Caret#

The ^ operator behaves very similarly but it sticks closer to semantic versioning, and will always allow non-breaking updates. For example ^1.2.3 is equivalent to >=1.2.3 <2.0.0 as none of the releases until 2.0 should break backwards compatibility. For pre-1.0 versions it also acts with safety in mind and treats ^0.3 as >=0.3.0 <0.4.0.

This is the recommended operator for maximum interoperability when writing library code.

Example: ^1.2.3
Composer

@查爾斯 ~和^的意思很接近，在x.y的情況下是一樣的都是代表x.y <= 版本號碼 < (x+1).0，但是在版本號碼是x.y.z的情況下有區別，舉個例子吧：

• ~1.2.3 代表 1.2.3 <= 版本號碼 < 1.3.0

• ^1.2.3 代表 1.2.3 <= 版本號碼 < 2.0.0

詳見： https://getcomposer.org/doc/a...

感謝 @北月武士 指正

^符號意思，用於匹配下一個重要版本

舉例：

composer.json

{    "require": {        "topthink/framework": "^5.0-rc1"    }}

執行sudo composer install 以後效果如下

匹配到了composer庫詳情頁的最新一個重要版本

https://packagist.org/package...

另外備忘下：犯這個錯誤是因為一個前提條件，我一般只關心次版本號碼，而不會關心修正號，所以如果你一直指定~x.y和^x.y的確是一樣的，哪怕庫的版本號碼就是用x.y.z的版本規範命名的

