php- floating point number shown in exponential form

Question

Could anyone please tell me why this happens,

$a  = 0.000022

echo $a // 2.2E-5

What I want to see is 0.000022 not 2.2E-5

Answer 1

The exponential form is the internal one use by every (?) programming language (at least CPUs "sees" floats this way). Use sprintf() to format the output

echo sprintf('%f', $a);
// or (if you want to limit the number of fractional digits to lets say 6
echo sprintf('%.6f', $a);

See Manual: sprintf() about more information about the format parameter.

Answer 2

use number_format() function

echo number_format($a,6,'.',',');

the result would be 0.000022