- array_map: documentation ( source)
- json_encode: documentation ( source)
<?php
$arr = [
[
"Twitter",
"Facebook",
], [
"rey",
"ray lard",
],
];
$arr = array_map(function($item){ return [$item[0] => $item[1]];},array_map(null, ...$arr));
echo json_encode($arr);