Online PHP editor | refs for C7Smm

<?php $array = [ ['record' => 1, 'sponsor' => 2, 'email' => 'some@email.com'], ['record' => 2, 'sponsor' => 2, 'email' => 'some1@email.com'], ['record' => 3, 'sponsor' => 2, 'email' => 'some2@email.com'], ['record' => 4, 'sponsor' => 2, 'email' => 'some3@email.com'], ]; $lookup = array_column($array, 'email', 'record'); var_export( array_map(fn($row) => $row += ['sponsor' => $lookup[$row['sponsor']]], $array) );