A very small exponential number in php

Question

I have a very small exponential number and it display like:

5.2255534523412e-7

Can I display it become:

5.22e-7

Answer 1

Use sprintf() to format the output

http://php.net/sprintf

$a = 5.2255534523412e-7;

// change 2 to be how many decimal places you want. The e treats it as scientific notation.
echo sprintf('%.2e', $a);