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  1. <?php
  2.  
  3. $toBeMerged = [];
  4.  
  5. for ($i = 4; $i < 10; $i++) {
  6. $toBeMerged[] = [ $i ];
  7. }
  8.  
  9. $result = \array_merge([1, 2, 3], ... $toBeMerged);
  10.  
  11. var_dump($result);
Success #stdin #stdout 0s 82560KB
stdin
Standard input is empty
stdout
array(9) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
  [6]=>
  int(7)
  [7]=>
  int(8)
  [8]=>
  int(9)
}