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isset array
  1. <?php
  2. $array = [1, 2, 3, 4, 5, 6, 7, 8, 9];
  3.  
  4. var_dump(isset($array));
  5.  
  6. $array[2] = null;
  7.  
  8. var_dump(isset($array));
  9. ?>
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