1 | <?php |
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2 | declare(strict_types = 1); |
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3 | |||
4 | namespace Fixtures\Innmind\Immutable; |
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5 | |||
6 | use Innmind\BlackBox\Set; |
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7 | use Innmind\Immutable\{ |
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8 | Map as Structure, |
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9 | Set as ISet, |
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10 | Sequence as ISequence, |
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11 | }; |
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12 | |||
13 | final class Map |
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14 | { |
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15 | /** |
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16 | * @template I |
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17 | * @template J |
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18 | * |
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19 | * @param Set<I> $keys |
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20 | * @param Set<J> $values |
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21 | * |
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22 | * @return Set<Structure<I, J>> |
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23 | */ |
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24 | public static function of( |
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25 | Set $keys, |
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26 | Set $values, |
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27 | Set\Integers $sizes = null, |
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28 | ): Set { |
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29 | return Set\Decorate::immutable( |
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30 | static fn(array $pairs): Structure => \array_reduce( |
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31 | $pairs, |
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32 | static fn(Structure $map, array $pair): Structure => ($map)($pair[0], $pair[1]), |
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33 | Structure::of(), |
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34 | ), |
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35 | Set\Sequence::of( |
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36 | new Set\Randomize( // forced to randomize as the composite will try to reuse the same key |
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37 | Set\Composite::immutable( |
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38 | static fn($key, $value): array => [$key, $value], |
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39 | $keys, |
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40 | $values, |
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41 | ), |
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42 | ), |
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43 | $sizes, |
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44 | )->filter(static function(array $pairs): bool { |
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45 | $keys = \array_column($pairs, 0); |
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46 | |||
47 | // checks unicity of values |
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48 | return ISequence::mixed(...$keys)->size() === ISet::mixed(...$keys)->size(); |
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49 | }), |
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50 | ); |
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51 | } |
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52 | } |
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53 |
Let?s assume that you have a directory layout like this:
and let?s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: