Question

您如何看待“ person1”的第一音符，“ person2”的第二音符和“ person3”的第三音符？

我一直在尝试这种方法，但是对我来说不起作用。 $学生['notes'] [0] [1]）

$person1 = [
   'name' => 'person1',
   'notes' => [1,2,3]
];

$person2 = [
   'name' => 'person2',
   'notes' => [4,5,6]
];

$person3 = [
   'name' => 'person3',
   'notes' => [7,8,9]
];

$data=[$person1,$person2,$person3];


foreach ($data as $student) {

   echo "<br>";
   echo $student['name']." " . "= ";
   echo implode (', ', $student['notes']);
   echo "<br>";
}


//Result
//person1 = 1, 2, 3
//person2 = 4, 5, 6
//person3 = 7, 8, 9


//Expected
//person1 = 1 (see the first 'note' data)
//person2 = 5 (see the second data of 'notes')
//person3 = 9 (see the third data of 'notes')


// It does not work with this form but can it be something like that?
// $student['notes'][0][1])

Answer 1

似乎您可以更改循环以包含index并使用您描述的模式根据索引位置定位正确的音符：

foreach ($data as $index => $student) {

   echo "<br>";
   echo $student['name']." " . "= ";
   echo $student['notes'][$index];
   echo "<br>";
}

您必须确保始终拥有与访问思想索引相同的注释

Answer 2

<?php
$person1 = [
    'name' => 'person1',
    'notes' => [1,2,3]
];

$person2 = [
    'name' => 'person2',
    'notes' => [4,5,6]
];

$person3 = [
    'name' => 'person3',
    'notes' => [7,8,9]
];

$data=[$person1,$person2,$person3];
echo '<pre>';
$counter = 0;
foreach ($data as $student) {

    echo $student['name']." " . "= " .$student['notes'][$counter];
    $counter++;
    echo '<br>';
}

输出为：

person1 = 1
person2 = 5
person3 = 9

解决此问题的方法很简单，使用计数器。因此，对于每个循环，您都需要将计数器增加1，然后使用计数器作为数组键指向该数组字段。

Answer 3

如果我正确地解释了您的问题，那么您在问如何定位多维数组的特定元素：

<?php
$data =
[
    [
        'name' => 'person1',
        'notes' => [1,2,3]
    ],
    [
        'name' => 'person2',
        'notes' => [4,5,6]
    ],
    [
        'name' => 'person3',
        'notes' => [7,8,9]
    ]
];

echo $data[0]['notes'][0], "\n"; // First note of first person
echo $data[1]['notes'][1], "\n"; // Second note of second person
echo $data[2]['notes'][2], "\n"; // Third note of third person

输出：

1
5
9

查看数组的特定数据

3 个答案: