When dividing two fractional numbers, how to get a fractional number, and not an exponent (2.1E-6)?

Question

PHP

I divide one number by another, as a result I get 2.1E-6, I can’t work with this further. I need to round this number, but when rounding I get zero)

I just divide the number a by the number b, as a result I get the exponent. Further, during operation, this exponent is displayed as zero. Suppose I then add to the resulting private unit, in the end it will all be equal to one, because this exponent (FLOAT (2.1E-6) - this is my output, and if it turns out to be an integer, then it turns out normally int (1 )) equals zero

Help please

Answer 1

2.1E-6 == 2.1×10 ^-6 == 0.000021
What do you think should be the result when rounded to an integer?