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  1. <?php
  2. $a = array(
  3.     'a' => NULL,
  4.     'b' => 1,
  5.     'c' => 1
  6. );
  7.  
  8. $b = array(
  9.     'a' => 1,
  10.     'b' => NULL,
  11.     'c' => 1    
  12. );
  13.  
  14. function arrayMergeIgnoringNull($arr1, $arr2) {
  15.     $new2 = array();
  16.     forEach ($arr2 as $key => $value) {
  17.         if (($value !== NULL) || !isSet($arr1[$key])) {
  18.             $new2[$key] = $value;
  19.         } 
  20.     }
  21.  
  22.     return array_merge($arr1, $new2);
  23. }
  24.  
  25. $c = arrayMergeIgnoringNull($a, $b);
  26. print_r($c);
  27. ?>
  28.  
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [a] => 1
    [b] => 1
    [c] => 1
)
https://ideone.com/an6bH9
Illustration of answer to http://stackoverflow.com/questions/16891397/php-merge-array-on-nulls.
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
secret

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