PHP recursive function Small Example

function Reversr_r ($STR) { if (strlen ($STR) >0) Reverse_r (substr ($STR, 1)); Echo substr ($str, 0, 1); Return } ?> function Reverse_i ($STR) { for ($i =1; $i <=strlen ($STR); $i + +) { Echo substr ($str,-$i, 1); } } Copy Code Code Analysis: Implement two functions, both of which can print the contents of a string in reverse order. The function Reversr_r is implemented recursively, and the function reverse_i () is implemented through loops.

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