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  1. <?php
  2.  
  3. $arr[] = [3,4];
  4.  
  5. var_dump($arr);
Success #stdin #stdout 0.02s 24448KB
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array(1) {
  [0]=>
  array(2) {
    [0]=>
    int(3)
    [1]=>
    int(4)
  }
}
https://ideone.com/m2fGpl
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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