Question

I have a list of numbers coming from a database that range from 0.001 to 10 and I need to display them with a minimum precision of 2 decimal places but no maximum precision.

Example numbers and expected conversion:

• 1 -> 1.00
• 0.1 -> 0.10
• 0.01 -> 0.01
• 0.001 -> 0.001
• 1.234 -> 1.234
• 0.035 -> 0.035
• 25.5 -> 25.50

Any Ideas?

Answer 1

function min_precision($x, $p)
{
  $e = pow(10,$p);
  return floor($x*$e)==$x*$e?sprintf("%.${p}f",$x):$x;
}

foreach (Array(1,0.1,0.01,0.001,1.234,0.035,25.5) as $x)
{
  echo $x . " -> " . min_precision($x,2) . "\n";
}

output:

1 -> 1.00
0.1 -> 0.10
0.01 -> 0.01
0.001 -> 0.001
1.234 -> 1.234
0.035 -> 0.035
25.5 -> 25.50