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php - php循环显示当前年份数据，如果没有找到而不是跳过

问题描述

所以我在一个循环中有一个循环都有年份数据，我试图弄清楚如果年份不匹配或存在于循环中而不是使用 continue 跳过条目，如何显示当前年份（2021 年）数据，任何想法或解决方案表示赞赏。

实时代码：http ://sandbox.onlinephpfunctions.com/code/b7cbef0613636aa41a41a7d5f283a2569ece9cb0

$dates = [
    ['date_starts'=>'2021-03-22'],
    ['date_starts'=>'2022-04-22'],
    ['date_starts'=>'2023-05-22']
];
              
foreach( $dates as $dt ){
    $start_date = $dt['date_starts'];
    
    $rates_results = [
        ['price'=>255,'year'=>'2021'],
        ['price'=>300,'year'=>'2023']
    ];

    $rateIDs = [];
    if ($rates_results) {
        foreach ($rates_results as $rates) {
            if(date("Y", strtotime($start_date)) !== ''.$rates['year'].''){
                continue;
            }
            
            $rateIDs [] = [
                'year' => $rates['year'],
                'price' => $rates['price']
            ];
        }
    }
    print_r($rateIDs);
}

所以这是我得到的输出：

Array
(
    [0] => Array
        (
            [year] => 2021
            [price] => 255
        )

)
Array
(
)
Array
(
    [0] => Array
        (
            [year] => 2023
            [price] => 300
        )

)

这就是我正在寻找的结果：

Array
(
    [0] => Array
        (
            [year] => 2021
            [price] => 255
        )

)
Array
(
    [0] => Array
        (
            [year] => 2021
            [price] => 255
        )

)
Array
(
    [0] => Array
        (
            [year] => 2023
            [price] => 300
        )

)

标签： phploopsforeach

解决方案

我认为你在嵌套 for 循环时过于复杂了。实际上，您有一个dates数组和一个rates数组，并且您想将一个与另一个交叉引用？

为此，您需要循环遍历dates数组，然后使用 PHParray_*函数查找特定年份的键；然后，如果什么也没找到，则使用当前年份。

$dates = [
    ['date_starts'=>'2021-03-22'],
    ['date_starts'=>'2022-04-22'],
    ['date_starts'=>'2023-05-22']
];

$rates_results = [
    ['price'=>255,'year'=>'2021'],
    ['price'=>300,'year'=>'2023']
];
$rate_year_array = array_column($rates_results, "year");             // Extract year "column" from $rates_results


foreach ($dates as $date_row) {
    $search_year  = date("Y", strtotime($date_row["date_starts"]));  // Get the year to look up from the date supplied
    $rate_key     = array_search($search_year, $rate_year_array);    // Search the "year" array and get the key for the current year
                                                                     // If not found then the value will be (bool) false
    
    if ($rate_key === false) {                                       // Check if the key was found
        $rate_key = array_search(date("Y"), $rate_year_array);       // If not find the key for the current year
    }

    // Output the date to an array
    $rateIDs[] = [
        'year'  => $rates_results[$rate_key]["year"],
        'price' => $rates_results[$rate_key]["price"],
    ];

}

print_r($rateIDs);  // Print the array

输出：

Array
(
    [0] => Array
        (
            [year] => 2021
            [price] => 255
        )

    [1] => Array
        (
            [year] => 2021
            [price] => 255
        )

    [2] => Array
        (
            [year] => 2023
            [price] => 300
        )

)

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