class FormatDecimalWithZeros {
/*
format_decimal_with_zeros
-------------------------
Converts a floating‑point number into a fixed‑length string with
leading zeros on the integer part.
Parameters:
num - the decimal number to format
width - total width of the integer part (zero‑padded)
decimals - number of digits after the decimal point
Returns:
A formatted string such as "00003.14159"
Example:
num = 3.14159, width = 5, decimals = 5
Output → "00003.14159"
*/
public static function formatDecimalWithZeros(float $num, int $width, int $decimals): string {
// Split into integer and fractional parts
$integer_part = (int) $num;
$fractional_part = $num - $integer_part;
// Format integer part with leading zeros
$int_str = sprintf("%0{$width}d", $integer_part);
// Format fractional part (starts with "0.xxx")
$frac_str = sprintf("%.{$decimals}f", $fractional_part);
// Remove the leading "0" before the decimal point
return $int_str . substr($frac_str, 1);
}
}
$num = 3.14159;
$result = FormatDecimalWithZeros::formatDecimalWithZeros($num, 5, 5);
echo "Original number: " . sprintf("%.5f", $num) . PHP_EOL;
echo "Formatted string: " . $result . PHP_EOL;
/*
run:
Original number: 3.14159
Formatted string: 00003.14159
*/
