Bug #72377 [Nab]: var_export bad number conversion

Edit report at https://bugs.php.net/bug.php?id=72377&edit=1 ID: 72377 User updated by: stefano dot galeazzi at probanet dot it Reported by: stefano dot galeazzi at probanet dot it Summary: var_export bad number conversion Status: Not a bug Type: Bug Package: *General Issues Operating System: Ubuntu 16.04, Arch Linux PHP Version: 7.0.7 Assigned To: cmb Block user comment: N Private report: N New Comment: Thanks a lot!!! ^_^ Previous Comments: ------------------------------------------------------------------------ [2016-06-10 13:42:03] nikic@php.net Change the serialize_precision setting to a lower value to restore the previous behavior. Note that this will also affect the output of serialize() and that the values exported in this way may not coincide with the original values. ------------------------------------------------------------------------ [2016-06-10 13:33:22] stefano dot galeazzi at probanet dot it No thanks (no time to be a master of floats), I just want it working, like it was in PHP 5. ------------------------------------------------------------------------ [2016-06-10 12:45:12] cmb@php.net 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://www.floating-point-gui.de/ Thank you for your interest in PHP. ------------------------------------------------------------------------ [2016-06-10 12:31:39] stefano dot galeazzi at probanet dot it Description: ------------ var_export() makes unnecessary and wrong number conversions. Test script: --------------- php --version PHP 7.0.7 (cli) (built: May 25 2016 18:40:26) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies php -r 'echo(var_export(0.98) . "\n");' 0.97999999999999998 Expected result: ---------------- php -r 'echo(var_export(0.98) . "\n");' 0.98 Actual result: -------------- php -r 'echo(var_export(0.98) . "\n");' 0.97999999999999998 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=72377&edit=1