Analysis of troublesome floating point operations in php

This article mainly introduces the troublesome floating-point number operations in PHP. It analyzes the use of PHP's round function for floating-point number operations in the form of examples. Friends in need can refer to it

This article analyzes the troublesome floating-point number operations in PHP with examples. floating point arithmetic. Share it with everyone for your reference, the details are as follows:

When doing e-commerce, it is inevitable to calculate the price, and then I discovered a pitfall in php. The correct value should be calculated by mouth, but the calculated value in php will be different from yours

Please Look at the code below:

$price=69.1; $count=100; $total=$price*$count-6910; echo $total;

Guess the value of the variable $total. Run this code and the output will be: -9.09494701773E-13
How to solve this problem?

Use the round function

The code is modified to:

$price=69.1; $count=100; $total=round($price*$count)-6910; echo $total;

The problem is solved, the output result is 0, correct

I hope this article will be helpful to everyone in PHP programming.

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