BCMath Arbitrary Precision Mathematics
BC Math
&reftitle.intro;
For arbitrary precision mathematics PHP offers BCMath which
supports numbers of any size and precision up to 2147483647 (or 0x7FFFFFFF) decimal digits,
if there is sufficient memory, represented as strings.
Valid (aka. well-formed) BCMath numbers are strings which match the regular expression
/^[+-]?[0-9]*(\.[0-9]*)?$/.
Passing values of type float to a BCMath function which expects
a string as operand may not have the desired effect due to the
way PHP converts float values to string, namely
that the string may be in exponential notation (which is not
supported by BCMath), and that, prior to PHP 8.0.0, the decimal separator is locale dependent
(while BCMath always expects a decimal point).
'0'
$num2 = -0.000005; // (string) -0.000005 => '-5.05E-6'
echo bcadd($num1, $num2, 6); // => '0.000000'
setlocale(LC_NUMERIC, 'de_DE'); // uses a decimal comma
$num2 = 1.2; // (string) 1.2 => '1,2'
echo bcsub($num1, $num2, 1); // => '0.0'
?>
]]>
&reference.bc.setup;
&reference.bc.constants;
&reference.bc.reference;