根据key在多维数组中查找值

Question

我有一个包含多个数组的数组，每个数组中的一个字段是另一个数组，请参见下文。我需要在“item_id”值为 177 的数组中找到“First name”的值。我该怎么做？

array(1) { 
[0]=> array(4) 
{ 
["product_id"]=> int(62) 
["item_id"]=> int(177) 
["quantity"]=> int(1) 
["options"]=> array(5) { 
[0]=> array(4) { 
["field_id"]=> string(13) "655259ef26f01" 
["label"]=> string(11) "First name:" 
["value"]=> string(4) "test" ["type"]=> string(4) "text" } 
[1]=> array(4) { ["field_id"]=> string(13) "65525a47553c3" 
["label"]=> string(10) "Last name:" 
["value"]=> string(4) "test" ["type"]=> string(4) "text" } 
[2]=> array(4) { 
["field_id"]=> string(13) "65525a658669b" 
["label"]=> string(15) "E-mail address:" 
["value"]=> string(17) "[email protected]" 
["type"]=> string(5) "email" } 
[3]=> array(4) { ["field_id"]=> string(13) "65525a964be34" 
["label"]=> string(27) "Language for questionnaire:" 
["value"]=> string(6) "German" 
["type"]=> string(6) "select" }
} } 

[1]=> array(4) { 
["product_id"]=> int(62) 
["item_id"]=> int(182) 
["quantity"]=> int(1) 
["options"]=> array(7) { 
[0]=> array(4) { 
["field_id"]=> string(13) "655259ef26f01" 
["label"]=> string(11) "First name:" 
["value"]=> string(4) "test" 
["type"]=> string(4) "text" 
} 
[1]=> array(4) { 
["field_id"]=> string(13) "65525a47553c3" 
["label"]=> string(10) "Last name:" 
["value"]=> string(4) "test" 
["type"]=> string(4) "text" 
} 
[2]=> array(4) { 
["field_id"]=> string(13) "65525a658669b" 
["label"]=> string(15) "E-mail address:" 
["value"]=> string(17) "[email protected]" 
["type"]=> string(5) "email" 
} 
[3]=> array(4) { 
["field_id"]=> string(13) "65525a7bb053f" 
["label"]=> string(46) "Send copy of the report to this email address:" 
["value"]=> string(17) "[email protected]" 
["type"]=> string(5) "email" 
} 
[4]=> array(4) { 
["field_id"]=> string(13) "65525a964be34" 
["label"]=> string(27) "Language for questionnaire:" 
["value"]=> string(7) "Chinese" ["type"]=> string(6) "select" }
} } }

我尝试了几件事，其中之一是：

$fname = $customs['item_id'][$itemID]['options']['field_id']['655259ef26f01']['value'];

Answer 1

您可以使用搜索

$custom

数组的函数，然后如果

item_id

与传递的内容匹配，则查找

options

子数组，然后在

value

匹配时取出

field_id

：

<?php

/*

Question Author: Pete
Question Answerer: Jacob Mulquin
Question: Find value in multidimensional array based on key
URL: https://stackoverflow.com/questions/77506541/find-value-in-multidimensional-array-based-on-key
Tags: , php, multidimensional-array, find

*/

$customs = [
    [
        'product_id' => 61,
        'item_id' => 177,
        'quantity' => 1,
        'options' => [
            [
                'field_id' => '655259ef26f01',
                'label' => 'First name:',
                'value' => 'test firstname1',
                'type' => 'text'
            ],
            [
                'field_id' => '65525a47553c3',
                'label' => 'Last name:',
                'value' => 'test lastname1',
                'type' => 'text'
            ]
        ]
    ],
    [
        'product_id' => 60,
        'item_id' => 177,
        'quantity' => 1,
        'options' => [
            [
                'field_id' => '655259ef26f01',
                'label' => 'First name:',
                'value' => 'test firstname1 again',
                'type' => 'text'
            ],
            [
                'field_id' => '65525a47553c3',
                'label' => 'Last name:',
                'value' => 'test lastname1',
                'type' => 'text'
            ]
        ]
    ],
    [
        'product_id' => 62,
        'item_id' => 182,
        'quantity' => 1,
        'options' => [
            [
                'field_id' => '655259ef26f01',
                'label' => 'First name:',
                'value' => 'test firstname2',
                'type' => 'text'
            ],
            [
                'field_id' => '65525a47553c3',
                'label' => 'Last name:',
                'value' => 'test lastname2',
                'type' => 'text'
            ]
        ]
    ]
];

function search_item_array($search, $item_id, $field_id)
{
    $found = [];
    foreach ($search as $record) {
        if ($record['item_id'] !== $item_id)
            continue;

        foreach ($record['options'] as $option) {
            if ($option['field_id'] === $field_id)
                $found[] = $option['value'];
        }
    }
    return $found;
}

$output = search_item_array($customs, 177, '655259ef26f01');
var_dump($output);

产量：

array(2) {
  [0]=>
  string(15) "test firstname1"
  [1]=>
  string(21) "test firstname1 again"
}