Question

我正在用PHP玩一个数组（还在学习数组！）

我有以下PHP代码从我的eventsTest表中提取数据，并回显数组；

    <?php
if ($result = $con->query("SELECT * FROM eventsTest")) {
    $array = array();
    while($row=mysqli_fetch_assoc($result)) {
        $array[] = $row;

    }
print "<pre>";
print_r($array);
print "</pre>"; // DEBUG--- show all array data
}

将我的数组打印为：

Array
(
    [0] => Array
        (
            [id] => 1
            [dateStart] => 2018-12-26
            [dateEnd] => 2018-12-26
            [name] => Test Event 1
        )

    [1] => Array
        (
            [id] => 2
            [dateStart] => 2018-12-27
            [dateEnd] => 2018-12-27
            [name] => Test Event 2
        )
)

代替[0] [1] [2]键作为索引，我可以将dateStart设置为数组索引的键吗？

例如：

    Array
(
    [2018-12-26] => Array
        (
            [0] => Array
                (
                    [dateEnd] => 2018-12-27
                    [name] => Test Event 1
                )

        )

    [2018-12-27] => Array
        (
            [0] => Array
                (
                    [dateEnd] => 2018-12-27
                    [name] => Test Event 2
                )

        )

    [2018-12-28] => Array
        (
            [0] => Array
                (
                    [dateEnd] => 2108-12-28
                    [name] => Test Event 3
                )

            [1] => Array
                (
                    [dateEnd] => 2018-12-28
                    [name] => Test Event 4
                )

        )

)

例如，如果有多个行具有相同的dateStart，是否也将dateStart分组在同一索引中？

Answer 1

赞：

while($row=mysqli_fetch_assoc($result)) {
    $array[$row['dateStart']][] = $row;
}

请注意，这将为您提供类似于您所要求的结构。

 Array
(
    [2018-12-26] => Array
        (
            [0] => Array
                (
                    [dateEnd] => 2018-12-27
                    [name] => Test Event 1
                )

        )

因为此$array[$row['dateStart']][] =是带有键$array[$row['dateStart']]的数组$row['dateStart']，所以它的值是包含行的数组。

Answer 2

您可以这样做：

<?php
if ($result = $con->query("SELECT * FROM eventsTest")) {
     $array = [];
     while($row=mysqli_fetch_assoc($result)) {
      if (isset($row['dateStart'])) {
       $array[$row['dateStart']] = $row;
      }
     }

print "<pre>";
print_r($array);
print "</pre>"; // DEBUG--- show all array data
}

设置一个array（）索引

2 个答案: