<?php
$float_num = 0.0456;
$exponent_part = ( floor(log($float_num, 2)) + 1 );
$mantissa_part = ( $float_num * pow(2, -$exponent_part) );
echo 'Floating value : '.$float_num."\n";
echo 'Exponent part  : '.$exponent_part."\n";
echo 'Mantissa part  : '.$mantissa_part."\n";
?>