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37 lines
766 B
37 lines
766 B
--TEST--
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Symfony pattern: conditional first-class callable stored in property
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--FILE--
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<?php
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class DeferredCallback
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{
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private mixed $callback = null;
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public function set(?callable $callback): void
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{
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$this->callback = null !== $callback ? $callback(...) : null;
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}
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public function run(string $value): ?string
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{
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if (null === $callback = $this->callback) {
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return null;
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}
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return $callback($value);
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}
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}
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function main(): void
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{
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$callback = new DeferredCallback();
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$callback->set(static fn (string $value): string => strtoupper($value));
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var_dump($callback->run('symfony'));
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$callback->set(null);
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var_dump($callback->run('symfony'));
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}
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?>
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--EXPECT--
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string(7) "SYMFONY"
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NULL
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