- var_dump: documentation ( source)
- array_merge: documentation ( source)
<?php
$veryImportantBankBalance = ['one' => 1, 'two' => 2];
$notSoImportantBankBalance = ['one' => 101, 'two' => 201];
$dontScrewUp = array_merge($veryImportantBankBalance, $notSoImportantBankBalance);
var_dump($dontScrewUp);