Online PHP editor | output for S0shX

@ 2018-03-20T21:54:50Z

<?php

$trucks = ['Serial' => 12345, 'Wheels' => 4, 'Color' => 'Black'];

$trailers = ['Serial' =>4321, 'Length'=>42];

$forklifts = ['Serial' =>5678, 'ForkLength'=>24];

$columns = array_keys(array_merge($trucks, $trailers, $forklifts));

$template = array_fill_keys($columns, null);

foreach ([$trucks, $trailers, $forklifts] as $array) {
    $result[] = array_merge($template, $array);
}

var_dump($result);

Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: array(3) { [0]=> array(5) { ["Serial"]=> int(12345) ["Wheels"]=> int(4) ["Color"]=> string(5) "Black" ["Length"]=> NULL ["ForkLength"]=> NULL } [1]=> array(5) { ["Serial"]=> int(4321) ["Wheels"]=> NULL ["Color"]=> NULL ["Length"]=> int(42) ["ForkLength"]=> NULL } [2]=> array(5) { ["Serial"]=> int(5678) ["Wheels"]=> NULL ["Color"]=> NULL ["Length"]=> NULL ["ForkLength"]=> int(24) } }

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