PHP - Round more than 14 decimal places

Solution:

For lots of decimal places, you'd better use BC Math rather than trying to force PHP to do it.

$result = bcdiv(1, 3, 20);
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You can change the precision ini setting, but you won't get the results you're expecting.

Solution:

You can also use the decimal extension with a reasonably high precision like 28, which then supports up to 28 significant digits.

$decimal = new Decimal(1, 28) / 3;

echo $decimal->round(28); 

// 0.3333333333333333333333333333 
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