How to Efficiently Search for a Specific Value in a Specific Key Across Subarrays of a Multidimensional Array?

Searching Multidimensional Arrays for Specific Values in Specific Keys

Identifying the presence of a specific value within a particular key across all subarrays of a multidimensional array poses a common challenge in programming. To efficiently accomplish this task, we outline a loop-based approach that traverses all subarrays.

Loop-Based Solution

In the absence of a faster method, a simple loop proves to be an effective solution. By employing a nested loop structure, we can systematically iterate through the multidimensional array, checking each subarray for the presence of the target value.

The code snippet below demonstrates this approach:

<code class="php">function checkValueInArrayKey($array, $key, $val) {
    foreach ($array as $item) {
        if (isset($item[$key]) && $item[$key] == $val) {
            return true;
        }
    }
    return false;
}</code>

Example Usage

Consider the following multidimensional array:

<code class="php">$my_array = array(
    0 =>  array(
        "name"   => "john",
        "id"    =>  4
    ),
    1   =>  array(
        "name" =>  "mark",
        "id" => 152
    ),
    2   =>  array(
        "name" =>  "Eduard",
        "id" => 152
    )
);</code>

To determine if the array contains a value with the key "id," we can utilize the function as follows:

<code class="php">$result = checkValueInArrayKey($my_array, "id", 152);

echo ($result) ? "True" : "False"; // Outputs "True"</code>

This solution provides a reliable and straightforward method for searching a multidimensional array for a specified value in a specified key.

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