Number formating - always 2 to 4 decimals after decimal separator and with thousand separator

Question

I have number:

2000
100
0.1
0.15
0.1555

But I need show these number in this format:

2,000.00
100.00
0.10
0.15
0.1555

I will never have more than 4 decimals after decimal separator. If after decimal separator are only null, I need to display 2 nulls (3. example above).

How I can format these numbers to get required format? Thank you!

EDIT: I can't use just number_format function, because with this function I can only set how many decimals will be after decimal separator, but as I wrote above - sometimes there will be 2, sometimes 4. So, if my number is 2000.0001 and I set this number_format(2000.0001, 4) output will be 2000.0001, but other number like 0.1 will output 0.1000, but I need it with 0.10 format.

Use `number_format` to get 4 digits, then remove any zeroes at the end. — Barmar, May 05 '15 at 20:35
possible duplicate of [Format a number with grouped thousands](http://stackoverflow.com/questions/10424120/format-a-number-with-grouped-thousands) — ledesma, May 05 '15 at 20:36
@ledesma That doesn't show how to get a variable number of digits after the decimal. — Barmar, May 05 '15 at 20:36
it gives you a [link](http://us.php.net/number_format) which explains how to do it. — ledesma, May 05 '15 at 20:40
@ledesma There's nothing in `number_format` that does this by itself. — Barmar, May 05 '15 at 20:42

score 2 · Accepted Answer · answered May 05 '15 at 20:39

2

First use number_format to add the commas and get 4 digits after the decimal. Then use a regular expression to remove up to 2 trailing zeroes.

$formatted = preg_replace('/0{1,2}$/', '', number_format($input, 4));

DEMO

answered May 05 '15 at 20:39

Barmar

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Number formating - always 2 to 4 decimals after decimal separator and with thousand separator

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