Extracting Values from a Two-Dimensional PHP Array by ID

In PHP, working with two‑dimensional arrays is common, and sometimes you need to extract a one‑dimensional value based on certain conditions.

Example data:

$arr = [
    [
        "id" => 1,
        "view" => 2,
        "category_id" => 2,
        "title" => "标题一",
        "model" => 12,
        "desc" => "摘要",
    ],
    [
        "id" => 123,
        "view" => 2,
        "category_id" => 1,
        "title" => "标题二",
        "model" => 101,
        "desc" => "摘要",
    ]
];

Requirement:

Extract the sub‑array whose id is 123 and obtain the value of a specific key (e.g., "title").

Solution:

We can create a function getval to achieve this:

function getval($arr, $id, $key){
    foreach ($arr as $v){
        if($v['id'] == $id){
            return $v[$key];
        }
    }
}

The function accepts three parameters: $arr: the two‑dimensional array to search. $id: the id value to match. $key: the key whose value should be returned.

Usage example:

$title = getVal($arr, 123, 'title');
var_dump($title);    // string(9) "标题二"

By calling getval, you can retrieve the desired data based on the id and key.