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  1. <?php
  2.  
  3. function custom_array_merge() {
  4.     // variable number of inputs
  5.     $arrays = func_get_args();
  6.  
  7.     // consolidate into array of items => count/array(of counts) across inputs
  8.     $counts = array_map('array_count_values', $arrays);
  9.     $consolidated = call_user_func_array('array_merge_recursive', $counts);
  10.  
  11.     // reduce array of counts (where applicable) to maximum count
  12.     $maximums = array_map(function($v) { 
  13.         return is_array($v) ? max($v) : $v;
  14.     }, $consolidated);
  15.  
  16.     // build result -- could be faster with array_fill() and concatenating 
  17.     // but that would definitely use up more memory 
  18.     $result = [];
  19.     foreach ($maximums as $item => $times) {
  20.         for ($i = 0; $i < $times; ++$i) {
  21.             $result[] = $item;
  22.         }
  23.     }
  24.  
  25.     return $result;
  26. }
  27.  
  28. $result = custom_array_merge(
  29. 	['room', 'page', 'room'], 
  30. 	['book', 'book','book','room'],
  31. 	['page', 'room']
  32. );
  33.  
  34. print_r($result);
Success #stdin #stdout 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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Array
(
    [0] => room
    [1] => room
    [2] => page
    [3] => book
    [4] => book
    [5] => book
)
https://ideone.com/y8kkxX
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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