rfc:argument_unpacking
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rfc:argument_unpacking [2013/08/31 09:32] – change exception -> e_strict nikic | rfc:argument_unpacking [2017/09/22 13:28] (current) – external edit 127.0.0.1 | ||
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* Date: 2013-08-30 | * Date: 2013-08-30 | ||
* Author: Nikita Popov < | * Author: Nikita Popov < | ||
- | * Status: | + | * Status: |
- | * Proposed for: PHP 5.6 | + | * Patch: https:// |
- | * Patch: https:// | + | |
* Mailing list discussion: http:// | * Mailing list discussion: http:// | ||
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</ | </ | ||
- | It's possible to use '' | + | It's possible to use '' |
<code php> | <code php> | ||
- | test(1, 2, ...[3, 4], 5, 6, ...[7, 8]); // [1, 2, 3, 4, 5, 6, 7, 8] | + | $args1 = [1, 2, 3]; |
+ | $args2 = [4, 5, 6]; | ||
+ | test(...$args1, ...$args2); // [1, 2, 3, 4, 5, 6] | ||
+ | test(1, 2, 3, ...$args2); | ||
+ | </ | ||
+ | |||
+ | However, it is not possible to use normal arguments after argument unpacking was used. Both of the following are invalid: | ||
+ | |||
+ | <code php> | ||
+ | test(...$args1, 4, 5, 6); | ||
+ | test(...$args1, | ||
</ | </ | ||
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<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) | ||
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</ | </ | ||
- | By-reference passing will not work if the unpacked entity is a Traversable. Instead an '' | + | By-reference passing will not work if the unpacked entity is a Traversable. Instead an '' |
<code php> | <code php> | ||
test(...new ArrayIterator([1, | test(...new ArrayIterator([1, | ||
- | // Strict standards: Cannot pass by-reference argument 3 of test() by unpacking a Traversable, | + | // Warning: Cannot pass by-reference argument 3 of test() by unpacking a Traversable, |
</ | </ | ||
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* It's not possible to determine the number of elements in a Traversable ahead of time. As such we can not know whether unpacking the Traversable will or will not hit a by-reference argument. | * It's not possible to determine the number of elements in a Traversable ahead of time. As such we can not know whether unpacking the Traversable will or will not hit a by-reference argument. | ||
* It's not possible to determine if a Traversable has support for by-reference iteration or if it will trigger an error if this is requested. | * It's not possible to determine if a Traversable has support for by-reference iteration or if it will trigger an error if this is requested. | ||
+ | |||
+ | ==== String keys ==== | ||
+ | |||
+ | In order to ensure forward-compatibility with [[rfc: | ||
===== Backward Compatibility ===== | ===== Backward Compatibility ===== | ||
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===== Patch ===== | ===== Patch ===== | ||
- | The diff can be found here: https:// | + | The patch for this features is available as a PR: https:// |
+ | |||
+ | ===== Vote ===== | ||
+ | |||
+ | As this is a language change a two third majority is required. | ||
+ | |||
+ | Voting started 2013-12-21 and ended 2014-01-11. | ||
- | The patch is based off the variadics implementation, | + | <doodle title=" |
+ | * Yes | ||
+ | * No | ||
+ | </ | ||
===== Support in other languages ===== | ===== Support in other languages ===== |
rfc/argument_unpacking.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1