Удалить дубликаты в массиве в php

Question

Мой массив:

Array ( 
[0] => Array ( [month] => November [Average Purchase Price] => 2.52 [Total Purchase Gallons] => 84000 ) 
[1] => Array ( [month] => October [Average Purchase Price] => 2.615 [Total Purchase Gallons] => 63000 ) 
[2] => Array ( [month] => November [Average Customer Price] => 2.79 [Total Customer Gallons] => 25000 ) 
[3] => Array ( [month] => October [Average Customer Price] => 2.9050000000000002 [Total Customer Gallons] => 5500 ) )

Я хочу иметь возможность отображать [месяц] и не дублировать его, но все же связать другие значения с правильным месяцем. Чтобы добраться до этого момента, я сделал array_merge, чтобы собрать их вместе, как вы их видите.

По отдельности они выглядят так:

# 1

Array ( 
[0] => Array ( [month] => November [Average Purchase Price] => 2.52 [Total Purchase Gallons] => 84000 ) 
[1] => Array ( [month] => October [Average Purchase Price] => 2.615 [Total Purchase Gallons] => 63000 ) )

# 2

Array ( 
[0] => Array ( [month] => November [Average Customer Price] => 2.79 [Total Customer Gallons] => 25000 ) 
[1] => Array ( [month] => October [Average Customer Price] => 2.9050000000000002 [Total Customer Gallons] => 5500 ) ) 

Я пробовал array_unique, но это не сработало. Я использую оператор foreach для вывода значений.

Спасибо!

SQL Запросы:

$sql = "SELECT month, AVG(price) AS 'Average Purchase Price', SUM(gallons) as 'Total Purchase Gallons' from purchase_contracts
group BY month";
$purch = mysqli_query($con, $sql) or die(mysqli_error($con));
while ($rows = mysqli_fetch_assoc($purch))
{ 
    $purch_items[] = $rows;
}


$sql1 = "SELECT month, AVG(price) AS 'Average Customer Price', SUM(gallons) as 'Total Customer Gallons' from customer_contracts
 group BY month";
 $cust = mysqli_query($con, $sql1) or die(mysqli_error($con));
 while ($rows1 = mysqli_fetch_assoc($cust))
 { 
   $cust_items[] = $rows1;
 }

Answer 1

Из ваших исходных двух массивов просто повторно проиндексируйте month и рекурсивно объедините их:

$result = array_merge_recursive(array_column($array1, null, 'month'),
                                array_column($array2, null, 'month'));

Что дает:

Array
(
    [November] => Array
        (
            [month] => Array
                (
                    [0] => November
                    [1] => November
                )
            [Average Purchase Price] => 2.52
            [Total Purchase Gallons] => 84000
            [Average Customer Price] => 2.79
            [Total Customer Gallons] => 25000
        )
    [October] => Array
        (
            [month] => Array
                (
                    [0] => October
                    [1] => October
                )
            [Average Purchase Price] => 2.615
            [Total Purchase Gallons] => 63000
            [Average Customer Price] => 2.905
            [Total Customer Gallons] => 5500
        )
)

Упрощение доступа к любому ключу от месяца:

echo $result['October']['Average Purchase Price'];
echo $result['October']['Average Customer Price'];
// etc...

или l oop:

foreach($result as $month => $values) {
    echo $month;
    echo $values['Average Purchase Price'];
    echo $values['Average Customer Price'];
    // etc...
}

Однако вы редактировали в двух запросах, которые можно объединить. Это может сработать или задать другой вопрос, и кто-то, несомненно, может дать вам один запрос:

SELECT month, AVG(price) AS 'Average Purchase Price', SUM(gallons) AS 'Total Purchase Gallons'
    FROM purchase_contracts GROUP BY month

UNION ALL

SELECT month, AVG(price) AS 'Average Customer Price', SUM(gallons) AS 'Total Customer Gallons'
    FROM customer_contracts GROUP BY month

Answer 2

Это простая итерация:

<?php

$oldArr = [
    ['month' => 'November', 'Average Purchase Price' => 2.52, 'Total Purchase Gallons' => 84000],
    ['month' => 'October', 'Average Purchase Price' => 2.615, 'Total Purchase Gallons' => 63000],
    ['month' => 'November', 'Average Customer Price' => 2.79, 'Total Customer Gallons' => 25000],
    ['month' => 'October', 'Average Customer Price' => 2.9050000000000002, 'Total Customer Gallons' => 5500]
];

$newArr = [];
foreach ($oldArr as $item) {
    $month = $item['month'];
    if (!array_key_exists($month, $newArr)) {
        $newArr[$month] = $item;
    }
}

echo '<pre>';
print_r($newArr);