<?php
$food = [
1 => 'яблоко',
2 => 'груша',
3 => 'арбуз',
4 => 'морковка',
5 => 'огуречик',
];
$keys = [4,5];
$filtered = array_filter($food, function($food_key) use ($keys) { }, ARRAY_FILTER_USE_KEY);
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