如何获取关联数组的当前元素数？

Say I have this array

说我有这个数组

$array = array('pen' => 'blue', 'paper' => 'red', 'ink' => 'white');

When I loop through it

当我循环它

$string = '';
foreach ($array AS $key=>$value) {
    $string .= $key . ' = ' . $value;
}

I want to get the "line number" of the element the loop is currently on.

我想得到循环当前所在元素的“行号”。

If the loop is on "pen" I would get 1. If the loop is on "paper" I would get 2. If the loop is on "ink" I would get 3.

如果循环是“笔”，我会得到1.如果循环是“纸”我会得到2.如果循环是“墨水”，我会得到3。

Is there an array command for this?

这有一个数组命令吗？

3 个解决方案

#1

No. You will have to increment an index counter manually:

不可以。您必须手动递增索引计数器：

$string = '';
$index = 0;
foreach ($array as $key=>$value) {
    $string .= ++$index . ") ". $key . ' = ' . $value;
}

#2

Use array_values() function to extract values from array. It indexes array numerically and $key will be the index of value in loop.

使用array_values（）函数从数组中提取值。它以数字方式对数组进行索引，$ key将是循环中的值索引。

$array = array('pen' => 'blue', 'paper' => 'red', 'ink' => 'white');
$array = array_values($array);

$string = '';
foreach ($array as $key => $value) {
    $string .= $key + 1 . ' = ' . $value;
}

#3

$i = 0;
foreach ($array as $key=>$value) { // For each element of the array
    print("Current non-associative index: ".$i."<br />\n"); // Output the current index

    $i++; // Increment $i by 1
}

Hope that helps.

希望有所帮助。

#1