rfc:argument_unpacking
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rfc:argument_unpacking [2014/01/11 12:12] – -> Implemented nikic | rfc:argument_unpacking [2017/09/22 13:28] (current) – external edit 127.0.0.1 | ||
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Line 39: | Line 39: | ||
</ | </ | ||
- | It's possible to use '' | + | It's possible to use '' |
<code php> | <code php> | ||
Line 46: | Line 46: | ||
test(...$args1, | test(...$args1, | ||
test(1, 2, 3, ...$args2); | test(1, 2, 3, ...$args2); | ||
- | test(...$args1, | + | </ |
+ | |||
+ | However, it is not possible to use normal arguments after argument unpacking was used. Both of the following are invalid: | ||
+ | |||
+ | <code php> | ||
+ | test(...$args1, | ||
+ | test(...$args1, 4, 5, 6, ...$args2); | ||
</ | </ | ||
Line 74: | Line 80: | ||
<code php> | <code php> | ||
- | var_dump(1, 2, ...null, 3, 4); | + | var_dump(1, 2, ...null, |
// Warning: Only arrays and Traversables can be unpacked | // Warning: Only arrays and Traversables can be unpacked | ||
// int(1) int(2) int(3) int(4) | // int(1) int(2) int(3) int(4) | ||
Line 213: | Line 219: | ||
} | } | ||
} | } | ||
- | </ | ||
- | |||
- | ==== Normal arguments after unpacked arguments ==== | ||
- | |||
- | Some people also had doubts regarding the usefulness of allowing '' | ||
- | |||
- | One use-case for this pattern are the variants of '' | ||
- | |||
- | <code php> | ||
- | array_udiff(...$arrays, | ||
- | array_udiff_uassoc(...$arrays, | ||
- | </ | ||
- | |||
- | While this kind of API was undoubtedly a bad choice in the first place, I see little reason not to support calls to them. | ||
- | |||
- | Another use case is appending one additional argument to a variadic argument list. For example, the following snippet adds an additional '' | ||
- | |||
- | <code php> | ||
- | $this-> | ||
</ | </ | ||
rfc/argument_unpacking.1389442371.txt.gz · Last modified: 2017/09/22 13:28 (external edit)