- array_intersect_key: documentation ( source)
- reset: documentation ( source)
- print_r: documentation ( source)
<?php
$data = ['locale_date' => 'date'];
$x = array_intersect_key($data, [
'locale_date' => 1,
'locale_time' => 1,
'locale_datetime' => 1,
]);
print_r(reset($x));