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PHP recursive function small example

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Release： 2016-07-25 08:54:04
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  2. function reversr_r($str)
  3. {
  4. if (strlen($str)>0)
  5. reverse_r(substr($str,1));
  6. echo substr($str,0 ,1);
  7. return;
  8. }
  9. ?>
  11. function reverse_i($str)
  12. {
  13. for($i=1;$i<=strlen($str);$i++)
  14. {
  15. echo substr($str,-$i,1);
  16. }
  17. }
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Code analysis: Implement two functions, both of which can print the contents of a string in reverse order. The function reversr_r is implemented through recursion, while the function reverse_i() is implemented through looping.



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php递归函数小例子
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