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  1. <?php
  2.  
  3. $list = array (
  4. 	1	=> '215070121',
  5. 	5	=> '215001216',
  6. 	12	=> '215050121',
  7. 	21	=> '215010127',
  8. 	50	=> '215080122'
  9. );
  10.  
  11. function getClosest($search, $arr) {
  12.    $closest = null;
  13.    foreach ($arr as $price => $id) {
  14.       if ($closest === null || abs($search - $closest) > abs($price - $search)) {
  15.          $closest = $price;
  16.       }
  17.    }
  18.    return $arr[$closest];
  19. }
  20.  
  21. echo getClosest(10, $list);
Success #stdin #stdout 0.01s 52488KB
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215050121
https://ideone.com/ru6JwA
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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