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Tilde and caret version constraints in Composer

Link – May 18th 2015

There are also some syntactic sugar operators like `~` (tilde) and `^` (caret).

`~4.1.3` means `>=4.1.3,<4.2.0`,

`~4.1` means `>=4.1.0,<5.0.0` (most used),

`~0.4` means `>=0.4.0,<1.0.0`,

`~4` means `>=4.0.0,<5.0.0`.

The caret sign is slightly different:

`^4.1.3` (most used) means `>=4.1.3,<5.0.0`,

`^4.1` means `>=4.1.0,<5.0.0`, same as `~4.1` but:

`^0.4` means `>=0.4.0,<0.5.0`, this is different from `~0.4` and is more useful for defining backwards compatible version ranges.

`^4` means `>=4.0.0,<5.0.0` which is the same as `~4` and `4.*`.

http://blog.madewithlove.be/post/tilde-and-caret-constraints/

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