Discussion on how to improve PHP recursion efficiency _php Tutorial

In actual code programming, we will find that on my IIS server (CGI) mode, my PHP recursive efficiency test results are:

Cost of non-recursive calls: 0.036401009559631
Cost of recursive call: 0.053439617156982

On my Apache server, my test results are:

Cost of non-recursive calls: 0.022789001464844
Cost of recursive call: 0.014809131622314

The result of PHP recursion is the exact opposite, and the PHP version is the same.

It seems that the efficiency of PHP recursion to specific analysis of specific problems.

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