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Convert a hex string into a 32-bit IEEE 754 float number in PHP

By: Julian L in PHP Tutorials on 2011年04月08日 [フレーム]

Convert a hex string into a 32-bit IEEE 754 float number. This function is 2 times faster then the below hex to 32bit function. This function only changes datatypes (string to int) once. Also, this function is a port from the hex to 64bit function from below.

<?php
function hexTo32Float($strHex) {
 $v = hexdec($strHex);
 $x = ($v & ((1 << 23) - 1)) + (1 << 23) * ($v >> 31 | 1);
 $exp = ($v >> 23 & 0xFF) - 127;
 return $x * pow(2, $exp - 23);
}
?>
<?php
//example
echo hexTo32Float("C4028000"); // outputs: -522
echo hexTo32Float("457F9000"); // outputs: 4089
echo hexTo32Float("2D7F5"); // outputs: 6.00804264307E-39
echo hexTo32Float("0002D7F5"); // outputs: 6.00804264307E-39
echo hexTo32Float("47D9F95E"); // outputs: 111602.734375
?>



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