PHP: Search multi-dimensional array for specific key value and return another key's value from the same sub-array

md-array-search.php

<?php
// Multi-dimensional Array to search through
$a = [
    [
        'item' => 1,
        'code' => 100
    ],
    [
        'item' => 2,
        'code' => 200
    ],
    [
        'item' => 3,
        'code' => 300
    ],
    [
        'item' => 4,
        'code' => 400
    ]
];
// Array to pass for our search parameters
$search = [
    // Key to search for with value as needle
    'item' => 3  
];
// Target key we want the value for
$targetKey = 'code';
// Get the target value via built-in PHP Array functions
// with a Closure and binding with use()
$targetValue = array_column(array_filter($a, function($x) use ($search) {
    if ($x[key($search)] === $search[key($search)]) {
        return $x;
    }
}), $targetKey)[0];

echo $targetValue; // 300
?>