Edit File: InjectContentTypeTrait.php
<?php declare(strict_types=1); namespace Laminas\Diactoros\Response; use function array_keys; use function array_reduce; use function strtolower; trait InjectContentTypeTrait { /** * Inject the provided Content-Type, if none is already present. * * @return array Headers with injected Content-Type */ private function injectContentType(string $contentType, array $headers): array { $hasContentType = array_reduce( array_keys($headers), static fn($carry, $item) => $carry ?: strtolower($item) === 'content-type', false ); if (! $hasContentType) { $headers['content-type'] = [$contentType]; } return $headers; } }
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