CODEWITHSUNDEEP
phpprecision
Matt
Matt

Reputation: 95

Float division returning int - PHP 7

Doing what should be a straight forward calculation in PHP 7. The following never produces a float result. Running var_dump($C) returns int(2)

$A = 0.04;
$B = 0.20;

$C = 3*($A/$B)^2;

echo $C;

I don't need the result to be float type, I need the precision.

I've tried setting the precision using ini_set('precision', n). I've tried the code on three environments and getting the same result. Declaring (float) is also does not work.

What am I doing wrong?

Upvotes: 0

Views: 586

Answers (4)

Nishant Nair
Nishant Nair

Reputation: 2007

try using

<?php

$A = 0.04;
$B = 0.20;

$C = 3 * pow(($A/$B),2);

echo $C; //output: 0.36

Upvotes: 0

Franz Gleichmann
Franz Gleichmann

Reputation: 3568

^ does not calculate the power, but XOR (which casts float to int). to calculate the power, use pow() or in PHP5.6+ **

<?php
$A = 0.04;
$B = 0.20;

$C = 3*($A/$B)**2;

echo $C; //output: 0.12

Upvotes: 1

Indrasis Datta
Indrasis Datta

Reputation: 8618

You should use pow() instead.

$C = 3 * pow(($A/$B), 2);

var_dump($C);  // float(0.12)

Upvotes: 0

Nifil
Nifil

Reputation: 535

3*($A/$B)^2

Means 3 * (A/B) XOR 2 (^ means xor) so bascially the result you are seeing is the result of a bitwise XOR on the result of your division.
If you want to raise the result to the power 2, you should use the pow() function. You can read about it here: http://php.net/manual/en/function.pow.php .

Upvotes: 1

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