Logarithms.php
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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
class Logarithms
{
/**
* LOG_BASE.
*
* Returns the logarithm of a number to a specified base. The default base is 10.
*
* Excel Function:
* LOG(number[,base])
*
* @param mixed $number The positive real number for which you want the logarithm
* @param mixed $base The base of the logarithm. If base is omitted, it is assumed to be 10.
*
* @return float|string The result, or a string containing an error
*/
public static function withBase($number, $base = 10)
{
try {
$number = Helpers::validateNumericNullBool($number);
Helpers::validatePositive($number);
$base = Helpers::validateNumericNullBool($base);
Helpers::validatePositive($base);
} catch (Exception $e) {
return $e->getMessage();
}
return log($number, $base);
}
/**
* LOG10.
*
* Returns the result of builtin function log after validating args.
*
* @param mixed $number Should be numeric
*
* @return float|string Rounded number
*/
public static function base10($number)
{
try {
$number = Helpers::validateNumericNullBool($number);
Helpers::validatePositive($number);
} catch (Exception $e) {
return $e->getMessage();
}
return log10($number);
}
/**
* LN.
*
* Returns the result of builtin function log after validating args.
*
* @param mixed $number Should be numeric
*
* @return float|string Rounded number
*/
public static function natural($number)
{
try {
$number = Helpers::validateNumericNullBool($number);
Helpers::validatePositive($number);
} catch (Exception $e) {
return $e->getMessage();
}
return log($number);
}
}