Adding numbers with decimal points in large quantity in PHP

Question

i am trying adding numbers like this

$ctr = 0.0000001 + 0.0000001+ 0.0000001+ 0.0000001+ 0.0000001+ 0.0000001; echo floatval($ctr);

it gives result like this 2.0E-5

i have tried, number_format, round etc... but result is same, it should be 0.0000006

please help me to make this happened.

I hope it doesn't give you 2.0E-5 as a result, but rather 6.0E-7 — Mark Baker
– Mark Baker, Commented Oct 30, 2013 at 9:19
Ignoring the spurious cast to float ($ctr already is a float); look at using sprint() if you want to display all the digits, otherwise live with the scientific notation that numbers default to using if there are lots of digits — Mark Baker
– Mark Baker, Commented Oct 30, 2013 at 9:20

Kita · Accepted Answer · 2013-10-30 09:28:45Z

0

I think you can try BCMath as it advertises:

For arbitrary precision mathematics PHP offers the Binary Calculator which supports numbers of any size and precision, represented as strings

A sample code:

$sum = bcadd('0.0000001','0.0000001',7); // 7 = num of digits after decimal point echo $sum; // 0.0000002

edited Oct 30, 2013 at 9:28

answered Oct 30, 2013 at 9:21

Kita

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3 Comments

Mark Baker Over a year ago

Surely a bit overkill for the values that OP is working with... the problem seems to be a lack of understanding of scientific notation (e.g. basic mathematics)

Kita Over a year ago

@MarkBaker now I can see that aspect of this question :)

Kita Over a year ago

@user2341915 printf("%0.7f",$ctr); from @MarkBaker must be what you are looking for.

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