在 PHP 中使用 in_array 从数组中搜索时查找索引

发布于 2024-12-14 11:59:11 字数 840 浏览 1 评论 0原文

我的目标是找出运算符是什么，以及它在原始 $operatorArray 中的位置（其中包含各种运算符，例如“+”、“-”等...）

所以我设法检查 $operator 何时匹配与我现有的 $operatorArray 中的另一个运算符，但是我需要知道在 $operatorArray 中的何处找到它。

foreach ($_SESSION['explodedQ'] as $operator){ //search through the user input for the operator. 

        if (in_array("$operator", $operatorArray)) { //if the operator that we found is in the array, then tell us what it is

            print_r("$operator"); //prints the operator found
            print_r("$positionNumber"); //prints where the operator is

        } //if operator 
        else{

            $positionNumber++; //The variable which keeps count on where the array is searching. 
        }

我尝试过 Google/Stack 搜索，但问题是，我实际上不知道要 Google 搜索什么。我搜索过诸如“从 in_array 中查找索引”等内容......但我不知道该怎么做。如果您能为我提供一种简单的方法来了解如何实现这一目标，我将不胜感激。感谢您抽出时间。

原文

My aim is to find out what the operator is, and where it was in the original $operatorArray (which contains the various operators such as "+", "-" etc... )

So I have managed to check when $operator matches with another operator in my existing $operatorArray, however I need to know where in $operatorArray it is found.

foreach ($_SESSION['explodedQ'] as $operator){ //search through the user input for the operator. 

        if (in_array("$operator", $operatorArray)) { //if the operator that we found is in the array, then tell us what it is

            print_r("$operator"); //prints the operator found
            print_r("$positionNumber"); //prints where the operator is

        } //if operator 
        else{

            $positionNumber++; //The variable which keeps count on where the array is searching. 
        }

I've tried Google/Stack searching, but the thing is, I don't actually know what to Google search. I've searched for things like "find index from in_array" etc... and I can't see how to do it. If you could provide me with a simple way to understand how to achieve this, I would be greatful. Thanks for your time.

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￡冰雨忧蓝° 2024-12-21 11:59:11

array_search 将执行您要查找的操作

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安人多梦 2024-12-21 11:59:11

直接取自 PHP 手册：

array_search() - 在数组中搜索给定值，如果成功则返回相应的键。

如果您正在搜索非关联数组，它将返回相应的键，即您要查找的索引。对于非连续索引数组（即 array(1 => 'Foo', 3 => 'Bar', ...)），您可以使用 array_values() 的结果 并在其中搜索。

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好久不见√ 2024-12-21 11:59:11

您可能想尝试一下

foreach($_SESSION['explodedQ'] as $index => $operator) { /* your stuff */ }

这样，一旦 in_array() 命中正确的 $operator，您就可以打印 $index。

You might want to give this a try

foreach($_SESSION['explodedQ'] as $index => $operator) { /* your stuff */ }

That way you can print the $index as soon as your in_array() hits the right $operator.

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戏剧牡丹亭 2024-12-21 11:59:11

我认为你需要 array_search()

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;

i think you need array_search()

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;

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