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@ 2019-11-03T10:08:06Z

<?php

$array1 = [
  310 => 0,
  311 => 0,
  312 => 0,
  313 => 0,
  314 => 0,
  315 => 0
];

$array2 = [
  "2019-05-17" => [
    312 => 3000.00
  ],
  "2019-06-20" => [
    312 => 3000.00
  ],
  "2019-06-27" => [
    313 => 5000.00,
    315 => 3000.00
  ]
];

var_export(array_map(fn($row) => $row += $array1,$array2));

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

33.62 ms | 405 KiB | 5 Q