这啥玩意？

// 原材料重量
$material = 1000;

// 一份酸菜鱼所需鱼片量
$bigFish = 200;
$smallFish = 100;

// 酸菜鱼数量
$bigNum = 3;
$smallNum = 4;

// 平均分配原材料到大份酸菜鱼和小份酸菜鱼
$bigFishWeight = $bigFish $bigNum;
$smallFishWeight = $smallFish $smallNum;
$totalFishWeight = $bigFishWeight + $smallFishWeight; // 总鱼片量

// 计算每份菜所需的原材料量
$averageWeight = $material / $totalFishWeight;

// 计算大份酸菜鱼和小份酸菜鱼所需要的鱼片量
$bigFishWeight = $averageWeight;
$smallFishWeight = $averageWeight;

echo "大份酸菜鱼每份所需的鱼片量为：{$bigFishWeight}克；\n";
echo "小份酸菜鱼每份所需的鱼片量为：{$smallFishWeight}克；\n";

两层for循环，外层（大份）0～5，内层0～10

for ($i=0; $i<=5; $i++) {
    for ($k=0; $k<=10; $k++) {
        if (($i*200+$k*100) === 1000) {
            echo '大份：'.$i.';小份：'.$k."\n";
        }
    }
}

以下条件随便设置

$total = 1100; // 或者其他
$a = 200; // 或者其他
$b = 100; // 或者其他
$acount = $bcount = floor($total / ($a + $b));
$rest = $total % ($a + $b);
// 这里我优先把剩余材料(200g)做大份
if ($rest > $a) {
    $acount += 1;
} else {
   $bcount += floor($rest / $b);
}
// 4大份 3小份
// 如果优先剩余材料做小份则直接
$bcount += floor($rest / $b);
// 3大份 5小份