Stream: New Array Organization

<?php

# Courtesy

$arr = [
    'azul-XG',
    'branco-PP',
    'azul-XG',
    'preto-PP',
    'preto-M',
    'branco-G',
    'preto-G',
    'vermelho-M',
    'preto-GG',
    'azul-P',
    'preto-GG',
    'azul-XG'
];

foreach ($arr as $value) {
    [$color,$size] = explode('-',$value);
    $new_arr[$color][$size] = isset($new_arr[$color][$size]) ? $new_arr[$color][$size] + 1 : 1;
}

var_dump($arr,$new_arr);