<?php $array = [ 'mc_gross' => 10.17, 'protection_eligibility' => 'Eligible', 'address_status' => 'unconfirmed', 'payer_id' => 'STTAC7UV2CVJ4' ]; var_export( array_reduce( array_keys($array), fn($result, $k) => $result + [str_replace('_', '', ucwords($k, '_')) => $array[$k]], [] ) );
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