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  1. <?php
  2.  
  3. $numeros = range(1,12);
  4.  
  5. echo join(",",$numeros);
  6.  
  7. echo PHP_EOL;
  8. echo PHP_EOL;
  9.  
  10. print_r($numeros);
Success #stdin #stdout 0.02s 24240KB
stdin
Standard input is empty
stdout
1,2,3,4,5,6,7,8,9,10,11,12

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 10
    [10] => 11
    [11] => 12
)