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Tilde and caret version constraints in Composer

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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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