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How to implement string flip in PHP

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php中世界最好的语言 Original
2018-04-11 10:11:07 1997browse

This time I will show you how to implementstring flipping in PHP. What are theprecautions for PHP to implement string flipping?. The following is a practical case, let's take a look.

The example in this article describes how to implement the string flip function in PHP. Share it with everyone for your reference, the details are as follows:

When it comes to the method of achieving string reversal, everyone will think of using

loop. Indeed, looping is a small memory footprint and simple to implement. But there is another way to achieve such a function, and that isrecursion.

PHP supports

recursive functions. A recursive function is the function calling itself. These functions are particularly useful for dynamically browsing data structures such as joined lists and trees.

Example:

0){ reverse_r(substr($str,1)); } echo substr($str,0,1); return; } //循环实现字符串翻转 function reverse_i($str){ for($i=1; $i<=strlen($str);$i++){ echo substr($str,-$i,1); } return; } reverse_r("Hello"); reverse_i("everyone"); ?>
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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