Semantic Versioning Ranges

versioning-ranges.txt

For a simplistic view on what versioning ranges look like, see below:

Version                   Range
>=1.0                     1.0.0 - *.*.*
>=1.0 <2.0                1.0.0 - 1.*.*
>=1.0 <1.1 || >=1.2       1.0.0 - 1.*.* || 1.2.0 - *.*.*
>=1.0 <1.1                1.0.0 - 1.*.*
>=1.0.0 <2.1              1.0.* - 2.0.*
>=1.0.0 <=2.1.0           1.0.0 - 2.1.0
~1.2                      1.2.0 - 1.*.*
~1.2.3                    1.2.3 - 1.2.*
^1.2.3                    1.2.3 - 1.*.*
^0.3                      0.3.0 - 0.3.*
^1.2                      1.2.0 - 1.*.*

Notes:
- Using ~ specifies a minimum version, but allows the last digit specified to go up.
- The ^ operator behaves very similarly but it sticks closer to semantic versioning,
  and will always allow non-breaking updates.
- Major version zero (0.y.z) is for initial development. Anything MAY change at any
  time. The public API SHOULD NOT be considered stable.

More information can be found here: https://getcomposer.org/doc/articles/versions.md
And here: https://semver.org/