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  1.  
  2.  
  3. <?php
  4. $_POST['fibnum']=1;
  5.  
  6. if(isset($_POST['fibnum'])){
  7.  
  8.  
  9.     $fibnum = $_POST['fibnum'];
  10.  
  11.  
  12.     function fibRec($fibnum){
  13.  
  14.         if ($fibnum < 0){
  15.         return ( "There are no Fibonacci numbers of negative values.");
  16.         }
  17.             elseif ($fibnum == 0){
  18.  
  19.                 return ("0");
  20.             }
  21.  
  22.                 elseif ($fibnum == 1){
  23.  
  24.                     return ("1");
  25.                 }
  26.  
  27.                     else {
  28.  
  29.                         $sum = fibRec($fibnum-1)+fibRec($fibnum-2); 
  30.                         return ($sum);
  31.                     }
  32.  
  33.     }
  34.         $fib = fibRec($fibnum); 
  35.         echo $fib;          
  36.  
  37. }           
  38. ?>
Success #stdin #stdout 0.02s 52472KB
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1
https://ideone.com/e0xeY7
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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