number_format() causes error “A non well formed numeric value encountered”

问题

I am using number_format to round floats to only 2 decimal digits. The problem is that some of my inputs don't have more than 2 decimals digits to begin with. So the code:

number_format($value, 2)

Instead of peacefully adding 0 in case it doesn't have enough decimal digits, it raises errors inside Apache log and that's not desirable.

So number_format(2.1, 2) or number_format(0, 2) will raise error in Apache log.

[Thu Jun 30 17:18:04 2011] [error] [client 127.0.0.1] PHP Notice: A non well formed numeric value encountered in /home/tahoang/Desktop/Projects/weatherData/weatherData.php on line 41

How to fix this?

回答1:

Try type casting first parameter of number_format() to float:

$format = number_format((float)0, 2);

$format = number_format(floatval(0), 2);

回答2:

Try to replace decimal point and after that cast to float.

var_dump((float)number_format((float)str_replace(",", ".", "20,5"), 2, ".", ""));
result: float(20.5);

Without replacing:

var_dump((float)number_format(floatval("20,5"), 2, ".", ""));
result: float(20);
var_dump((float)number_format((float) "20,5", 2, ".", ""));
result: float(20);

回答3:

I used this:

str_replace(array(".", ","), array(",", "."), $value)

Maybe it'll help someone out.

回答4:

Function is recognizing it as a string.

Convert to number by adding zero:

number_format($NUMBER+0)

回答5:

When doing calculations, use

number_format($value, 2, ".", "")

And if you would like to display numbers with .00 at the end (like "50.50" not "50.5") then you would use

numer_format($value, 2)

来源：https://stackoverflow.com/questions/6542403/number-format-causes-error-a-non-well-formed-numeric-value-encountered

标签

php

number-formatting