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<?php $json = '{"result":{"0":["Adobe FrameMaker Document (.fm, .book)","application\/dca-rft"],"1":["Adobe Illustrator File (.ai)","application\/vnd.illustrator"],"2":["Adobe InDesign File (.indd)","application\/vnd.indesign"],"3":["Adobe Photoshop Document (.psd)","application\/vnd.photoshop"]}}'; $decoded = json_decode($json, true); $saneFormat = []; foreach ($decoded['result'] as $pair) { list($type, $mime) = $pair; $saneFormat[$mime] = $type; } var_dump($saneFormat);

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