format a floating number using PHP

Question

I want to format a floating number, like this :

Input : 1.7
output : 01.70

I have already tried below function.

sprintf("%02.02f", 1.7);

Please help.

this could help to you http://stackoverflow.com/questions/28739818/php-how-to-add-leading-zeros-zero-padding-to-float-via-sprintf — nguaman, Feb 17 '16 at 12:48

Chetan Ameta · Answer 1 · 2016-02-17T13:02:55.690

4

Try:

sprintf('%05.2f', 1.7);

Explanation

This forum post pointed me in the right direction: The first number does neither denote the number of leading zeros nor the number of total charaters to the left of the decimal seperator but the total number of characters in the resulting string!

Example sprintf('%02.2f', 1.7); yields at least the decimal seperator "." plus at least 2 characters for the precision. Since that is already 3 characters in total, the %02 in the beginning has no effect. To get the desired "2 leading zeros" one needs to add the 3 characters for precision and decimal seperator, making it sprintf('%05.2f', 1.7);

edited Feb 17 '16 at 13:02

answered Feb 17 '16 at 12:51

Chetan Ameta

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This should be the accepted answer, due the explanation, the accepted answer here don't explain what or why works. My upvote for you. – Marcos Pérez Gude Feb 17 '16 at 13:58

score 1 · Answer 2 · answered Feb 17 '16 at 12:49

1

Are you tried with str_pad()? It's for strings, and that's what you need, because $var = 001 is an octal and $var = "001" is a string.

   $input = 1.7;
   $output = str_pad($input, "0", 2, STR_PAD_BOTH)

answered Feb 17 '16 at 12:49

Marcos Pérez Gude

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score 1 · Accepted Answer · answered Feb 17 '16 at 12:50

1

Try this

sprintf('%05.2f', 1.7);

answered Feb 17 '16 at 12:50

Ninju

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Whilst this will work, can you add an explanation of why so people can get a better understanding? – gabe3886 Feb 17 '16 at 12:52
I'm aware of an explanation too – Marcos Pérez Gude Feb 17 '16 at 13:56

format a floating number using PHP

3 Answers3