Remove trailing zeros from a string

Question

I would like to remove trailing zero's according to the following rules:

• The input number will always have 4 decimal places
• The output number should always have between 2 and 4 decimals
• If the last two digits after the decimal is a zero, then remove both of them
• If the last digit after the decimal is a zero, then remove it

Examples:

• 1.0000 -> 1.00
• 1.4000 -> 1.40
• 1.4100 -> 1.41
• 1.4130 -> 1.413
• 1.4136 -> 1.4136

I have considered the following:

if (substr($number, -2) == '00') return substr($number, 0, 4);
if (substr($number, -1) == '0') return substr($number, 0, 5);
return $number;

Are there any better ways of doing this?

Answer 1

I think this should work:

return preg_replace('/0{1,2}$/', '', $number);

$strings = array ('1.4000', '1.4100', '1.4130', '1.4136', '1.4001', '1.0041');
foreach ($strings as $number) {
  echo "$number -> " . preg_replace('/0{0,2}$/', '', $number) . "\n";
}

Produces:

1.4000 -> 1.40
1.4100 -> 1.41
1.4130 -> 1.413
1.4136 -> 1.4136
1.4001 -> 1.4001
1.0041 -> 1.0041