The _php technique of floating point arithmetic analysis with headache in PHP

In this paper, we analyze some of the frustrating floating-point arithmetic in PHP. Share to everyone for your reference, specific as follows:

In the electrical business, the calculation price is unavoidable, and then found a hole in PHP, multi-digit should be the correct value, PHP operation will not be the same as you

Take a look at the following code:

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

Guess what the value of the variable $total is, run this code output: -9.09494701773E-13
How to solve this problem?

Using the ROUND function

Code modified to:

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

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

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I hope this article will help you with the PHP program design.