PHP enter percentage number round to 2 decimal places not working

Question

php number round to 2 decimal places not working my number is 0.00000000000000000000001 and I want result as 0.01. I tried php number_format() func

Answer 1

0.01 is far far greater than 0.00000000000000000000001. You can not round it to 0.01 . 0.006 can be rounded to 0.01 because they are very close to each other.