WMPRO, WMMINI FW >= 1.0 WMMEGA FW >= 2.0

Return the natural logarithm of a number

$number: A number

Float: Natural logarithm of the number

<?
  $val=ln(1);
  print($val); // outputs 0
?>

The natural logarithm of a number is its logarithm to the base of the mathematical constant e, where e is an irrational and transcendental number approximately equal to 2.718281828459.

log10() - Return the base 10 logarithm of a number

power() - Return base raised to the power of exp