Question

是否可以在数组中搜索给定值并返回找到该值的所有索引？因此，对于此数组：

["Red","Green","Red","Blue"]

我需要

[0,2]

关于搜索“红色”。在这种情况下，搜索“ Yellow”将返回一个空数组。

Answer 1

您可以这样使用：

$array = ["Red","Green","Red","Blue"];
$output = array_keys($array, "Red");

$output将是[0,2]

Answer 2

我认为这应该可行：

$input = ["Red","Green","Red","Blue"];
$x = "Red";
$keys = array_keys(array_filter($input, function ($v) use ($x) { return $v === $x;}));

Answer 3

$arr = ["Red","Green","Red","Blue"];
$valueToSearchFor = ["Red"];
$keys = array_keys(array_filter($arr, function ($val1) use ($valueToSearchFor) { // filter the first array
    return array_filter($valueToSearchFor, function ($val) use ($val1) { // use the first array's value
        return $val == $val1; // compare them and then return them
    });
}));
var_dump($keys) // array(2) { [0]=> int(0) [1]=> int(2) }

首先我们对数组进行过滤，然后将值从第一个过滤器移至另一个过滤器，然后对数组进行匹配并返回它们。这也适用于多个值。

$arr = ["Red","Green","Red","Blue"];
$valueToSearchFor = ["Red", "Blue"];
$keys = array_keys(array_filter($arr, function ($val1) use ($valueToSearchFor) {
    return array_filter($valueToSearchFor, function ($val) use ($val1) {
        return $val == $val1;
    });
}));
var_dump($keys) // array(3) { [0]=> int(0) [1]=> int(2) [2]=> int(3) }

Answer 4

您可以使用foreach迭代数组：

foreach($input_arr as $key => $value){
  if($value == 'Red'){
    needed_key_arr[] = $key;
  }
}

此外，如果您可以拥有一组值，则搜索内容将使用：

$lookup_arr = ['Red', 'Green'];
foreach($input_arr as $key => $value){
  if(in_array($value, $lookup_arr)){
    needed_key_arr[] = $key;
  }
}

检索数组中的值的索引

4 个答案: