在 PHP 中，如何从具有多个键的多维数组中访问数据答案

【问题标题】：In PHP how do you access data from multidimensional arrays with multiple keys在 PHP 中，如何从具有多个键的多维数组中访问数据
【发布时间】：2020-03-07 15:31:11
【问题描述】：

这是数组：

$weatherData = [
    "Chicago" => [45, "fog",   ["Mon" => [44, "fog"], "Tue" => [42, "sleet"], "Wed" => [40, "rain"], "Thu" => [44, "cloudy"], "Fri" => [45, "cloudy"]]],
    "Paris" =>   [73, "sunny", ["Mon" => [75, "sunny"], "Tue" => [75, "sunny"], "Wed" => [68, "cloudy"], "Thu" => [66, "cloudy"], "Fri" => [60, "rain"]]],
    "Calgary" => [-8, "snow",  ["Mon" => [-7, "snow"], "Tue" => [-10, "snow"], "Wed" => [-3, "sleet"], "Thu" => [0, "cloudy"], "Fri" => [3, "sunny"]]]
];

我已经有了输出每个城市的一般信息的功能（例如：对于芝加哥，我输出了“45”和“雾”）：

function outputBox($weatherData)
{
    foreach ($weatherData as $key => $value) {
        echo "<article class='box'";
        echo "<h1>$key</h1>";
        echo "<div class='weather'>";
        echo "<img src='images/$key.jpg' />";
        echo "<div>";
        echo "<h2>$value[0]</h2>";
        echo "<p>$value[1]</p>";
        echo "</div>";
        echo "</div>";
    }

    outputForecast($weatherData);
}

现在我需要输出其他信息，例如芝加哥“周一 44 雾”、“周二 42 雨夹雪”…… 到目前为止，我得到了这个：

function outputForecast($weatherData){

    foreach ($weatherData[1] as $key => $value){
        echo "<section>";
        echo "<div>";
        echo "<h3>$key</h3>";
    }
}

我不知道为我的循环访问这些数字的正确代码是什么，但它应该输出周一至周五的详细信息，请帮忙谢谢！

【问题讨论】：

标签： php function multidimensional-array foreach associative-array

【解决方案1】：

Hy scoobidydoo，您已经接近解决方案，但您需要阅读有关 PHP 数组的信息。玩代码非常有趣。只需更改这两个功能，

解决方法如下： https://paiza.io/projects/Led6GCYVW6HV1dIZH6MdVQ?language=php

function outputBox($weatherData)
{
    foreach ($weatherData as $key => $value) {
        echo "<article class='box'>";
        echo "<h1>$key</h1>";
        echo "<div class='weather'>";
            echo "<img src='images/$key.jpg' />";
            echo "<div>";
            echo "<h2>$value[0]</h2>";
            echo "<p>$value[1]</p>";
        echo "</div>";
        echo "</article>";

        outputForecast($value[2]);
        echo '<hr/>';
    }
}

function outputForecast($valueDays){
    echo "<h2>Forecast</h2>";
    foreach ($valueDays as $key => $value){
        echo "<section>";
            echo "<div>";
                echo "<h3>$key</h3>";
                echo "<p>$value[0] - $value[1]</p>";
            echo "</div>";
        echo "</section>";
    }
}

【讨论】：

【解决方案2】：

你也可以这样，

function outputBox($weatherData)
{
    foreach ($weatherData as $key => $value) {
        echo $key.", ".$value[0].", ".$value[1].", ".'</br>';
        if(!empty($value[2])){
           foreach ($value[2] as $k1 => $v1) {
               echo '"'.$k1." ".$v1[0]." ".$v1[1].'"';
           }
        }
        echo '</br>';
    }
}

print_r(outputBox($weatherData));

输出：

Chicago, 45, fog, 
"Mon 44 fog""Tue 42 sleet""Wed 40 rain""Thu 44 cloudy""Fri 45 cloudy"
Paris, 73, sunny, 
"Mon 75 sunny""Tue 75 sunny""Wed 68 cloudy""Thu 66 cloudy""Fri 60 rain"
Calgary, -8, snow, 
"Mon -7 snow""Tue -10 snow""Wed -3 sleet""Thu 0 cloudy""Fri 3 sunny"

【讨论】：

【解决方案3】：

$weatherData = [
    "Chicago" => [45, "fog", ["Mon" => [44, "fog"], "Tue" => [42, "sleet"], "Wed" => [40, "rain"], "Thu" => [44, "cloudy"], "Fri" => [45, "cloudy"]]],
    "Paris" => [73, "sunny", ["Mon" => [75, "sunny"], "Tue" => [75, "sunny"], "Wed" => [68, "cloudy"], "Thu" => [66, "cloudy"], "Fri" => [60, "rain"]]],
    "Calgary" => [-8, "snow", ["Mon" => [-7, "snow"], "Tue" => [-10, "snow"], "Wed" => [-3, "sleet"], "Thu" => [0, "cloudy"], "Fri" => [3, "sunny"]]]
];

printData($weatherData);

function printData($weatherData)
{
    foreach ($weatherData as $key => $data) {
        echo '****<b>' . $key . ': ' . $data[0];
        echo ' ' . $data[1] . '</b>****<br>';
        echo json_encode($data[2]) . '<br><br>';
    }
}

输出

****Chicago: 45 fog****
{"Mon":[44,"fog"],"Tue":[42,"sleet"],"Wed":[40,"rain"],"Thu":[44,"cloudy"],"Fri":[45,"cloudy"]}
****Paris: 73 sunny****
{"Mon":[75,"sunny"],"Tue":[75,"sunny"],"Wed":[68,"cloudy"],"Thu":[66,"cloudy"],"Fri":[60,"rain"]}
****Calgary: -8 snow****
{"Mon":[-7,"snow"],"Tue":[-10,"snow"],"Wed":[-3,"sleet"],"Thu":[0,"cloudy"],"Fri":[3,"sunny"]}

【讨论】：