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@ 2022-09-27T05:52:50Z

<?php

$arrayFirst = [
  "index" => [
    'a' => '1',
  ],
  [
    'a' => '2',
  ]
];
$arraySecond = [
  "index" => [
    'b' => '1',
  ],
  [
    'b' => '2',
  ]
];

foreach ($arrayFirst as $k => &$row) {
    $row = array_merge($row, $arraySecond[$k]);
}
var_export($arrayFirst);

Output
Performance
VLD
References
Branches

array_merge: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive preview

53.26 ms | 402 KiB | 5 Q