- var_dump: documentation ( source)
<?php
$aMeters = [];
$aMeters[] = [];
$aMeters[0] += ['meter_maintenance_code' => 'MQ'];
$aMeters[0] += ['meter_number' => 'ALL',
'esp_rate_code' => 'OUSUCKS'];
unset($aMeters[0]);
var_dump($aMeters);