get_variables_different_arrays.php

<?php

$source = [
	'color' => ['red','blue','white','yellow','black'],
	'who' => ['rabbit','bear','wolf'],
	'else' => ['in space','in Russia','is hungry','is dead']
];

var_dump(recursion_calculate($source));

function recursion_vars(array $arr, array $arr2){
	$result = array();
	foreach($arr as $v){
		foreach($arr2 as $v2){
			$result[] = array_merge($v, $v2);
		}
	}
	return $result;
}

function recursion_calculate(array $arr){
	foreach ($arr as $k => $in) {
		foreach ($in as $t => $val){
			$arr[$k][$t] = array($k => $val);
		}
	}
	$source = false;
	foreach ($arr as $key => $array){
		if($source == false){
			$source = $array;
			continue;
		}
		$source = recursion_vars($source, $array);
	}
	return $source;
}