PRAMP Flatten a Dictionary in PHP

flatten.php

<?php

$list = [];
function flatten($array) {
	global $list;
	foreach ($array as $key => $value) {
		utility($value, $key);
	}

	return $list;
}


function utility($array, $prefix) {
	global $list;
	if(is_scalar($array)) {
		$list[$prefix] = $array;
		return $list;
	}

	foreach ($array as $key => $value) {
		$newKey = !empty($key) ? ($prefix . "." . $key) : $prefix;
		utility($value, $newKey);
	}

	return $list;
}

$array = [
	'name' => 'Bishwanath',
	'last_name' => 'kumar',
	'profession' => 'Engineer',
	'traits' => [
		'intell' => true,
		'exp' => [
			'2010' => 'college',
			'2014' => 'employed',
			'2016' => [
				'may' => 'test 1',
				'june' => 'test 2'
			],
			"" => [
				"a" => "b"
			]
		]
	]
];


print_r(flatten($array));