得到foreach循环数组的索引 [英] Get index of array in foreach loop

问题描述

考虑：

 的foreach（$行作为$行）{
    回声$行['身份证'];
    回声$行['姓名'];
    回声$行['姓氏'];
}
 

我如何获得 $行目前指数任何给定的迭代中，无需单独计数变量

我的尝试：

 的foreach（$行作为$关键=＆GT; $行）{
    回声$行['身份证'];
    回声$行['姓名'];
    回声$行['姓氏'];
}
 

编辑下面

但 $键给我 $行的当前索引，而不是目前的指数 $行。

我想要做的是：

 的foreach（$行作为$行）{
    如果（CURRENT_INDEX（$行）== 0）{
        // 做一点事
    }
    回声$行['身份证'];
    回声$行['姓名'];
    回声$行['姓氏'];
}
 

据我所知，PHP不具有 CURRENT_INDEX（）函数或类似的东西。

下面就是 $行如下：

 阵列
（
    [0] =＆GT;排列
        （
            [ID] =＆GT; 1
            [名字] =＆GT;名字1
            [姓氏] =＆GT;姓氏1
        ）    [1] =＆GT;排列
        （
            [ID] =＆GT; 2
            [名字] =＆GT;名字2
            [姓氏] =＆GT;姓氏2
        ）    [2] =＆GT;排列
        （
            [ID] =＆GT; 3
            [名字] =＆GT;名字3
            [姓氏] =＆GT;姓氏3
        ）
）
 

解决方案

您引用的数组的值作为一个数组。这就是为什么它是给你的 $行['身份证']

您需要使用 $键因为这是在 $行数组当前的指数值。

当您使用的foreach（$行作为$关键=＆GT; $行）这是它实际上是这样做的：

• $行 - 通过输入数组循环


• $键 - 第一维数组中的当前位置的键


• $行 - 第一维数组在当前位置值

Given:

foreach ($rows as $row) {
    echo $row['id'];
    echo $row['firstname'];
    echo $row['lastname'];
}

How do I get the current index of $rows during any given iteration, without a separate count variable?

What I tried:

foreach ($rows as $key => $row) {
    echo $row['id'];
    echo $row['firstname'];
    echo $row['lastname'];
}

EDIT BELOW

But $key gives me the current index of $row, not the current index of $rows.

What I want to do is:

foreach ($rows as $row) {
    if(current_index($rows) == 0){
        // do something
    }
    echo $row['id'];
    echo $row['firstname'];
    echo $row['lastname'];
}

To my knowledge, PHP doesn't have a current_index() function or something like it.

Here's what $rows looks like:

Array
(
    [0] => Array
        (
            [id] => 1
            [firstname] => Firstname one
            [lastname] => Lastname one
        )

    [1] => Array
        (
            [id] => 2
            [firstname] => Firstname two
            [lastname] => Lastname two
        )

    [2] => Array
        (
            [id] => 3
            [firstname] => Firstname three
            [lastname] => Lastname three
        )
)

解决方案

You are referencing the array value as an array. That's why it is giving you $row['id']

You need to use $key as that is the value of your current index in the $rows array.

When you use foreach($rows as $key => $row) this is what it is practically doing:

• $rows - input array to loop through
• $key - key of your current location in the first dimensional array
• $row - value of your current location in the first dimensional array

这篇关于得到foreach循环数组的索引的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！