Online PHP editor | refs for Dcee0

<?php $a = [ 'a' => 'some value', 'b' => 'some value', 'c' => 'some value' ]; $b = [ 'a' => 'another value', 'd' => 'another value', 'e' => 'another value', 'f' => 'another value' ]; $c = [ 'b' => 'some more value', 'x' => 'some more value', 'y' => 'some more value', 'z' => 'some more value' ]; $defaults = array_fill_keys(array_keys($a + $b + $c), ''); $result = ['one' => $a, 'two' => $b, 'three' => $c]; foreach ($result as $k => &$row) { $row = array_merge($defaults, $row); } var_export($result);