PHP | BCMath：如何获得bcscale值？

Question

How do I get the scale set in BCMath's bcscale() method?

Example:

bcscale(25);

How do I get the 25? Thanks!

Answer 1

You can't. Currently you can get only the bcmath.scale INI setting, which defaults to 0:

print ini_get('bcmath.scale');

Unfortunatelly bcscale() didn't change the bcmath.scale INI setting and you can't get the scale factor without a workaround like that:

bcscale(25);

function get_bcscale()
{
    $sqrt = bcsqrt('2');
    return strlen(substr($sqrt, strpos($sqrt, '.') + 1));
}

var_dump(get_bcscale()); # int(25)

Answer 2

This is fixed in PHP 7.3.

Calling bcscale(10) will return the previous scale and calling bcscale() will return the current scale.

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