ID: 49214 Updated by: der...@php.net Reported By: leeja120 at gmail dot com -Status: Open +Status: Bogus Bug Type: Output Control Operating System: windows xp PHP Version: 5.2SVN-2009-08-10 (snap) New Comment:
Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2009-08-11 07:05:15] sjoerd-php at linuxonly dot nl Thank you for your report. The behavior you describe, although it is somewhat strange, is not a bug. It is documented: "If PHP encounters a number beyond the bounds of the integer type, it will be interpreted as a float instead." "The size of a float is platform-dependent, although a maximum of ~1.8e308 with a precision of roughly 14 decimal digits is a common value (the 64 bit IEEE format)." ------------------------------------------------------------------------ [2009-08-10 20:49:09] leeja120 at gmail dot com Description: ------------ Print floating Reproduce code: --------------- <?PHP echo 946744073709551614; ?> Expected result: ---------------- 946744073709551614 Actual result: -------------- 946744073709550000 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49214&edit=1
