PHP仅显示重要（非零）小数

Question

In PHP (using built-in functions) I'd like to convert/format a number with decimal, so that only the non-zero decimals show. However, another requirement of mine is that if it's a number without a decimal value, I'd still like to show that zero. Examples:

9.000 -> 9.0
9.100 -> 9.1
9.120 -> 9.12
9.123 -> 9.123

rtrim($value, "0") almost works. The problem with rtrim is that it leaves 9.000 as 9.. sprintf() seemed like a candidate, but I couldn't get it to have a variable amount of decimals. number_format() serves a different purpose, and those were all I could come up with...

Again, I'd like to point out that I am not looking for your homemade solutions to this, I'm looking for a way to accomplish this using internal PHP functionality. I can write a function that will accomplish this easily myself, so hold answers like that.

Answer 1

I don't think theres a way to do that. A regex is probably your best solution:

$value = preg_replace('/(\.[0-9]+?)0*$/', '$1', $value);

Demo:

php> $a = array('0.000', '0.0001', '0.0101', '9.000', '9.100', '9.120', '9.123');
php> foreach($a as $b) { echo $b . ' => ' . preg_replace('/(\.[0-9]+?)0*$/', '$1', $b)."
"; }
0.000 => 0.0
0.0001 => 0.0001
0.0101 => 0.0101
9.000 => 9.0
9.100 => 9.1
9.120 => 9.12
9.123 => 9.123