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<?php $array1 = [ ['ID' => 1], ['ID' => 2], ['ID' => 3], ['ID' => 4], ['ID' => 5], ]; $array2 = [ ['ID' => 2, 'NUM' => 200], ['ID' => 4, 'NUM' => 400], ]; $lookup = array_column($array2, null, 'ID'); var_export( array_map( fn($row) => $row + ($lookup[$row['ID']] ?? ['NUM' => 0]), $array1 ) );
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => array ( 'ID' => 1, 'NUM' => 0, ), 1 => array ( 'ID' => 2, 'NUM' => 200, ), 2 => array ( 'ID' => 3, 'NUM' => 0, ), 3 => array ( 'ID' => 4, 'NUM' => 400, ), 4 => array ( 'ID' => 5, 'NUM' => 0, ), )
preferences:
66.05 ms | 407 KiB | 5 Q