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Asked
3 years, 6 months ago
php arrays variadic-functions spread-syntax
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No, PHP doesn't have a magic shortcut syntax: just the basic $b = array_merge($a, [3, 4]);
– Mark Baker
Jul 31 '17 at 15:00
It's part of PHP since December 2019 wiki.php.net/rfc/spread_operator_for_array
– Tomáš Votruba
May 11 '19 at 16:06
It's part of PHP since December 2019 or 2018? Current date of the my comment is, 13/05/2019
– chalo
May 13 '19 at 18:53
It will be available in PHP 7.4.
– CedX
Sep 23 '19 at 21:04
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What about if I want to preserve keys? array_merge is not sufficient in this case.
– Facedown
Apr 24 '18 at 16:08
@Facedownn did you try the code? array_merge preserves the keys. Or you meant something else?
– OldGaurd01
Apr 25 '18 at 1:30
Following example will not preserve keys causing 4 items on output, but I want only 2. array_merge(...[[2 => 'foo', 3 => 'bar'], [2 => 'foo', 3 => 'baz']]) I was looking for something like + (plus) operator for such case.
– Facedown
Apr 26 '18 at 10:57
@Facedown please ask another question, this is not related to what you are asking.
– OldGaurd01
Apr 26 '18 at 13:56
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Very nice! What's your source for this?
– Nathan Arthur
Apr 24 '19 at 18:19
Found the proposal, looks like this isn't yet a thing, but is likely to be in 7.4: wiki.php.net/rfc/spread_operator_for_array
– Nathan Arthur
Apr 24 '19 at 18:23
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PHP supports the spread syntax for variadic functions .
In JavaScript, you can use the spread syntax to do this :
Parse error: syntax error, unexpected '...' (T_ELLIPSIS), expecting ']'
Is using the spread syntax this way not allowed in PHP? If so, is there an equally-as-elegant way to achieve the same effect?
The spread operator in the arrays RFC has been implemented in PHP 7.4:
Caveat: The unpacked array/Traversable can only have integer keys. For string keys array_merge() is still required.
Update: Spread Operator in Array Expression
An array pair prefixed by … will be expanded in places during array definition. Only arrays and objects who implement Traversable can be expanded.
It's possible to do the expansion multiple times, and unlike argument unpacking, … can be used anywhere. It's possible to add normal elements before or after the spread operator.
Spread operator works for both array syntax(array()) and short syntax([]).
It's also possible to unpack array returned by a function immediately.
<---------------End of Update-------------------->
First of all you are referencing the Variadic function with arrays in wrong sense.
You can create your own method for doing this, or you can better use array_merge as suggested by @Mark Baker in comment under your question.
If you still want to use spread operator / ... , you can implement something like this yourself.
But to me, doing it like this is stupidity. Because you still have to use something like array_merge. Even if a language implements this, behind the scene the language is using merge function which contains code for copying all the elements of two arrays into a single array.
I wrote this answer just because you asked way of doing this, and elegancy was your demand.
In PHP 7.4 you can now use Spread Operators in array expressions.
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klondike-studio.ru/upload/files/blog/ bitrix _server_test. php
Spread operator should have a better performance than array_merge . It's because not only that spread operator is a language structure while array_merge is a function call, but also compile time optimization can be performant for constant arrays.
array_merge only supports array, while spread operator also supports objects implementing Traversable .
a link to the PHP manual entry for the feature
a link to the language specification section (if any)
rfc/spread_operator_for_array.txt · Last modified: 2019/05/13 12:45 by nikic
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PHP has already supported argument unpacking (AKA spread operator) since 5.6. This RFC proposes to bring this feature to array expression.
An array pair prefixed by ... will be expanded in places during array definition. Only arrays and objects who implement Traversable can be expanded.
It's possible to do the expansion multiple times, and unlike argument unpacking, ... can be used anywhere. It's possible to add normal elements before or after the spread operator.
Spread operator works for both array syntax( array() ) and short syntax( [] ).
It's also possible to unpack array returned by a function immediately.
In order to make the behavior consistent with argument unpacking , string keys are not supported. A recoverable error will be thrown once a string key is encountered.
It's not possible to unpack an array by reference.
However, if elements in the array to be unpacked are stored by reference, they will be stored by reference in the new array as well.
This change should not break anything.
This is kind of out of scope here to discuss other concat / merge operation. The important thing is we should make the behavior of same operator consistent and not to confuse userland developer. It's also why I changed the behavior for string keys in this revised version.
Some changes in opcache to support the new opcode is needed.
Voting started 2019-04-22 and ends 2019-05-06. A 2/3 majority is required.
After the project is implemented, this section should contain
Links to external references, discussions or RFCs
Keep this updated with features that were discussed on the mail lists.
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