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  1. <?php
  2. $arr1 = array(0 => 14, 5 => 444);
  3. $arr2 = array(0 => 104, 14 => 4444);
  4. var_dump($arr1 + $arr2);
Success #stdin #stdout 0.01s 20568KB
stdin
Standard input is empty
stdout
array(3) {
  [0]=>
  int(14)
  [5]=>
  int(444)
  [14]=>
  int(4444)
}