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PHP recursive function to find factorial

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Release： 2016-07-25 08:54:06
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  2. function demo($a)
  3. {
  4. if($a > 1)
  5. {
  6. $r=$a*demo($a-1);
  7. }else
  8. {
  9. $r=$a;
  10. }
  12. return $r;
  13. }
  15. $a=6;
  16. echo $a."The value of the factorial".demo($a);
  17. ?>
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php递归函数求阶乘
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