Question

我正在尝试创建一个存储各种相册的数组，

到目前为止，我有以下代码

$photos = array(
            array("karate","1","2"),
            array("judo","1","2"),
            array("kickboxing","1","2"),
            array("womenselfdefense","1","2")
            );

$sections = array("karate","judo","kickboxing","womenselfdefense");
foreach($sections as $keys => $section)
{
    echo count($photos[$section]);
}

但是我不认为我已经正确设置了我的阵列，理想情况下我希望主阵列$照片中有4个单独的阵列$ karate，$ judo，$ kickboxing，$ womenselfdefense。

我想首先计算每个数组中的项目数，然后在每个数组中选择一个随机项，但我相信目前我在photos数组中有4个未命名的数组，因此我的代码返回了几个Undefined index ：错误

任何人都可以帮助我吗

Answer 1

您可以使用相册的名称作为照片数组的键。

$oDate1 = new DateTime($datas['due_date']);
$due_date = $oDate1->format("M d, Y");
$sDate1 = $oDate1->format("M d, Y");

Answer 2

我认为您正在寻找一个associative array，它使用标签代替数字作为关键字：

$photos = array(
    "karate" => array("1","2"),
    "judo" => array("1","2"),
    "kickboxing" => array("1","2"),
    "womenselfdefense" => array("1","2")
);

foreach ($photos as $section=>$values) {
    //now $values is your array of numbers
    echo count($values);
}

或者，在现代语法中：

$photos = [
    "karate" => [1, 2],
    "judo" => [1, 2],
    "kickboxing" => [1, 2],
    "womenselfdefense" => [1, 2],
];

Answer 3

您正在尝试访问阵列而不为任何键分配更高级别的阵列。

尝试这样的事情：

$photos = array(
    'karate' => array("karate","1","2"),
    'judo' => array("judo","1","2"),
    'kickboxing' => array("kickboxing","1","2"),
    'womenselfdefense' => array("womenselfdefense","1","2")
);

Answer 4

我认为你的意思是使用

 echo count($photos[$keys]);

PHP在“父”数组中有多个“子”数组以及如何访问它们

4 个答案: