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This article will explain in detail how to achieve php integer inversion, the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Php to achieve integer inversion methods: 1, to create a PHP example file; 2, through the "function reverse ($x) {...}" method to achieve integer inversion.

The operating environment of this paper: Windows7 system, PHP7.1, Dell G3.

How to implement php integer inversion?

Integer inversion of PHP algorithm

Given a 32-bit signed integer, you need to reverse the number on each of the integer.

Example 1:

Enter: 123

Output: 321

Example 2:

Enter:-123

Output:-321

Example 3:

Input: 120

Output: 21

Note:

Assuming that our environment can only store 32-bit signed integers, the range of values is [− 231,231 − 1]. Based on this assumption, 0 is returned if the integer overflows after the inversion.

Class Solution {/ * @ param Integer $x * @ return Integer * / function reverse ($x) {$max = pow (2mai 31)-1; $min = pow (- 2ME 31); $strlen = strlen ($x); if ($x > = 0) {$num = (int) strrev ($x) } else {$num ='-'. (int) strrev (trim);} if ($min < $num & & $num < $max) {return $num;} else {return 0;}

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