将 PHP for 循环转换为 for each

问题描述

我对算法不太熟悉，有人可以帮我将这个 for 循环转换为 foreach 吗

Im not soo comfortable in algorithms can somebody please help me to convert this for loop to a foreach please

for($i = 0; $i < count($cartBookItems); $i++) {
    $currentCartBookItem = $cartBookItems[$i];
    if($currentCartBookItem->getBookID() == $book->getId()) {
        $newQuantity = $currentCartBookItem->getQuantity() + $quantity;
        $currentCartBookItem->setQuantity($newQuantity);
        $isItemAlreadyExists = true;
    }
}

推荐答案

foreach($cartBookItems as $each_book_item) {
    $currentCartBookItem = $each_book_item;
       if($currentCartBookItem->getBookID() == $book->getId()) {
             $newQuantity = $currentCartBookItem->getQuantity() + $quantity;
             $currentCartBookItem->setQuantity($newQuantity);
             $isItemAlreadyExists = true;
       }
}

更新

感谢@castis 的建议.您可以在循环迭代变量时直接使用 $currentCartBookItem.

Thanks to @castis for the suggestion. You can directly have $currentCartBookItem as you loop iteratable variable.

foreach($cartBookItems as $currentCartBookItem ) {
       if($currentCartBookItem->getBookID() == $book->getId()) {
             $newQuantity = $currentCartBookItem->getQuantity() + $quantity;
             $currentCartBookItem->setQuantity($newQuantity);
             $isItemAlreadyExists = true;
       }
}

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