Created with:

$extrafields = json_decode($item->extra_fields, true);
$extrafields = array_combine(array_column($extrafields,'id'),$extrafields);

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    string(85) "https://www.booking.com/hotel/de/villa-vinum-cochem.de.html?aid=1308479&label=Eintrag"
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  [24]=>
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  [34]=>
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</div>