<?php
	$data = ["rot","rot","schwarz","rot","rot","rot","schwarz"];
	$result = [];
	$keys =array_unique($data);
	foreach($keys as $key){
		$result[$key] = ['Abs'=>0,'Rel' =>0];
	}

	foreach($data as $color){
		$result[$color]['Abs'] += 1;
		$result[$color]['Rel'] += 1/count($data);
	}

	echo "<pre>";
	print_r($result);