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  1. <?php
  2.  
  3. $prime = array();
  4.  
  5. for ($i = 2; $i <= 20; $i++)
  6. {
  7.   for ($j = 2; $j*$j <= $i; $j++)
  8.     if ($i % $j == 0)
  9.       continue 2;
  10.  
  11.   $prime[] = $i; 
  12. }
  13.  
  14. var_dump($prime);
Success #stdin #stdout 0s 52488KB
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array(8) {
  [0]=>
  int(2)
  [1]=>
  int(3)
  [2]=>
  int(5)
  [3]=>
  int(7)
  [4]=>
  int(11)
  [5]=>
  int(13)
  [6]=>
  int(17)
  [7]=>
  int(19)
}
https://ideone.com/c0Wldf
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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