遍历多维数组：添加值到新数组并差异化处理匹配元素

Alright, let's break down how to solve this problem. Based on your sample array (which looks like a PHP nested array), we'll walk through iterating through the structure, extracting elements to a new array, and applying special logic to items that match specific values.

First, let's formalize your sample array into valid PHP code for clarity:

$originalArray = [
    [
        [
            'productCode' => 'HQ768H',
            'startTimeLocal' => '2018-04-17 14:00:00',
            'endTimeLocal' => '2018-04-17 16:00:00',
            'totalQuantity' => 2,
            'amount' => 170,
            'extras' => [],
            'transferReturn' => '',
            'subtotal' => 170
        ],
        [
            'productCode' => 'PLJ6HP',
            'startTimeLocal' => '2018-04-15 14:00:00',
            'endTimeLocal' => '2018-04-15 16:00:00',
            'totalQuantity' => 2,
            'amount' => 170,
            'extras' => [],
            'transferReturn' => '',
            'subtotal' => 170
        ]
    ]
];

Solution 1: Nested Loops (For Fixed Depth Arrays) #

If you know your array has a fixed 3-level structure, nested foreach loops are straightforward and efficient. Let's say we want to:

• Extract productCode, startTimeLocal, and amount into a new array
• Double the amount and add a special flag for items where productCode equals HQ768H

Here's the code:

$newArray = [];

// Iterate through the outer array
foreach ($originalArray as $level1) {
    // Iterate through the middle-level array of orders
    foreach ($level1 as $order) {
        // Base extraction of required fields
        $processedOrder = [
            'product_code' => $order['productCode'],
            'start_time' => $order['startTimeLocal'],
            'amount' => $order['amount']
        ];

        // Differentiated processing for matching values
        if ($order['productCode'] === 'HQ768H') {
            $processedOrder['amount'] *= 2; // Double the amount
            $processedOrder['is_special'] = true; // Add a special marker
        } else {
            $processedOrder['is_special'] = false;
        }

        // Add the processed item to our new array
        $newArray[] = $processedOrder;
    }
}

// Output the result
print_r($newArray);

Running this will give you:

Array
(
    [0] => Array
        (
            [product_code] => HQ768H
            [start_time] => 2018-04-17 14:00:00
            [amount] => 340
            [is_special] => 1
        )

    [1] => Array
        (
            [product_code] => PLJ6HP
            [start_time] => 2018-04-15 14:00:00
            [amount] => 170
            [is_special] => 
        )

)

Solution 2: Recursive Function (For Variable Depth Arrays) #

If your array might have unpredictable nesting levels, a recursive function is better—it will automatically traverse every level until it finds the order items we care about.

function processNestedOrders($array, &$resultArray) {
    foreach ($array as $item) {
        // Check if the current item is an order (has productCode field)
        if (isset($item['productCode'])) {
            $processed = [
                'product_code' => $item['productCode'],
                'start_time' => $item['startTimeLocal'],
                'amount' => $item['amount']
            ];

            // Apply your special logic here
            if ($item['productCode'] === 'HQ768H') {
                $processed['amount'] *= 2;
                $processed['is_special'] = true;
            }

            $resultArray[] = $processed;
        } 
        // If it's another nested array, recurse into it
        elseif (is_array($item)) {
            processNestedOrders($item, $resultArray);
        }
    }
}

$newArray = [];
processNestedOrders($originalArray, $newArray);
print_r($newArray);

Customizing the Differentiated Logic #

You can adjust the matching condition to fit your needs—for example:

• Match against totalQuantity instead of productCode
• Modify subtotal instead of amount
• Add multiple conditions (e.g., if ($order['productCode'] === 'HQ768H' && $order['totalQuantity'] > 1))

Just update the if block in the code above to match your specific requirements.

内容的提问来源于stack exchange，提问作者Jason Whalan