Calculate how many majority seats each party gained

majority_seats.php

<?php

$json = file_get_contents('https://gist.githubusercontent.com/nathggns/051203c3d7e72159de0d/raw/9e368d3a99a219a7fc487d327b86ebd4f6c8ed53/results.json') or die('Cannot fetch data');
$consts = json_decode($json, true) or die('Cannot decode data');

var_dump(array_reduce(array_map(function($const_name) use ($consts) {
	return [$consts[$const_name][0]['name'], $const_name];
}, array_filter(array_keys($consts), function($const_name) use($consts) {
	return $consts[$const_name][0]['share'] >= 0.5;
})), function($data, $pair) {
	$data[$pair[0]][] = $pair[1];

	return $data;
}, []));