PHP does not have the following math function in any extensions:frexp() - Extract Mantissa and Exponent of the Floating-Point ValueI've digged many C source codes, and found the simplest implementation as follows:<?phpfunction frexp ( $float ) { $exponent = ( floor(log($float, 2)) + 1 ); $mantissa = ( $float * pow(2, -$exponent) ); return( array($mantissa, $exponent) );}print_r(frexp(0.0345));print_r(frexp(21.539));?>Array( [0] => 0.552 [1] => -4)Array( [0] => 0.67309375 [1] => 5)I have compared the results using a lot of floats against C's frexp function - they are the same.Note that C and PHP uses different float precisions, for example "4619.3" gives:C: 0.56387939453125, 13PHP: 0.563879394531, 13/Assuming default configurations./
