Search multi-dimensional array based on key value pair. i.e. you have an array of posts, and you want to return the post with the id of `1231`

search_multi_array.php

<?php 

$posts = [
  [
    'id' => 1231,
    'title' => 'Test'
  ],
  [
    'id' => 1111,
    'title' => 'Test #2'
  ]
];

$key = array_search(1231, array_column($posts, 'id'));
$post = $key ? $posts[$key] : null;