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<?php declare(strict_types = 1); class HelloWorld { /** @var array<string, string> */ private $items; public function doFoo(string $input) { $this->items[$input] = $input; /*foreach ($this->items as $key => $value) { $this->requireString($key); }*/ } public function requireString(string $s) { } } $h = new HelloWorld(); $h->doFoo('1'); // bang
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