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| Total Lines | 12 | 
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| 1 | <?php  | 
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| 18 | public function __construct(  | 
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| 19 | /**  | 
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| 20 | * Key for structured data (like ClassParam behavior)  | 
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| 21 | *  | 
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| 22 | * When specified, looks for data under this key:  | 
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| 23 | * #[Input(key: 'user')] -> expects $query['user'] = ['name' => 'John', 'age' => 30]  | 
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| 24 | *  | 
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| 25 | * When null, uses flat parameter mapping:  | 
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| 26 | * #[Input] -> expects $query = ['firstName' => 'John', 'lastName' => 'Doe']  | 
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| 27 | */  | 
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| 28 | public readonly string|null $key = null,  | 
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| 29 |     ) { | 
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| 30 | }  | 
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| 32 |