<?php
$keywords['data'] = [
'a_key' => 'a_keyword',
'b_key' => 'b_keyword',
'c_key' => 'c_keyword',
];
$result = ['data' => [
'main' => $keywords['data'],
'secondary' => $keywords['data'],
]];
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array (
'data' =>
array (
'main' =>
array (
'a_key' => 'a_keyword',
'b_key' => 'b_keyword',
'c_key' => 'c_keyword',
),
'secondary' =>
array (
'a_key' => 'a_keyword',
'b_key' => 'b_keyword',
'c_key' => 'c_keyword',
),
),
)