- array_column: documentation ( source)
- var_export: documentation ( source)
- implode: documentation ( source)
<?php
$a = [
[['Name' => 'kumar'],['Name' => 'siva']],
[['Name' => 'Arun'],['Name' => 'Prem']]
];
foreach ($a as $i => $group) {
$result[$i][] = ['Name' => implode(', ', array_column($group, 'Name'))];
}
var_export($result);