<?php
 
$data = [
	'test' => [
		'a' => [
			'b' => 'something',
			5 => [
				'a' => [
					1 => 'test1',
					19 => 'test2',
					6 => 'test3',
				],
				0 => 'test',
			],
		],
		'b' => 1,
		2 => [
			3 => 'something',
			5 => 'somethingelse',
		],
		4 => 'body'
	],	
	'anothertest' => [
		'b' => 1,
		5 => [
			'test' => 1,
			2 => 'something',
			3 => 'somethingelse',
		],
	],
];
 
function reindex($array)
{
	$index = 0;
	$return = [];
 
	foreach ($array as $key => $value) {
		if (is_string($key)) {
			$newKey = $key;
		} else {
			$newKey = $index;
			++$index;
		}
 
		$return[$newKey] = is_array($value) ? reindex($value) : $value;
	}
 
	// Sort alphabetically, numeric first then alpha
	ksort($return, SORT_NATURAL);
 
	return $return;
}
 
$array = reindex($data);
 
print_r($array);

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