Req #45365 [Fbk->NoF]: non-native conversions from float to string

Edit report at https://bugs.php.net/bug.php?id=45365&edit=1 ID: 45365 Updated by: php-bugs@lists.php.net Reported by: rasmus at mindplay dot dk Summary: non-native conversions from float to string -Status: Feedback +Status: No Feedback Type: Feature/Change Request Package: Scripting Engine problem Operating System: * PHP Version: 5.2.6 Private report: N New Comment: No feedback was provided. The bug is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so and change the status of the bug back to "Re-Opened". Thank you. Previous Comments: ------------------------------------------------------------------------ [2014-12-27 20:09:12] kalle@php.net Please try using this snapshot: http://snaps.php.net/php-trunk-latest.tar.gz For Windows: http://windows.php.net/snapshots/ Float handling had a major revamp in 5.3, can you please try a snapshot and check if this bug still is present? ------------------------------------------------------------------------ [2008-06-26 12:27:51] rasmus at mindplay dot dk Description: ------------ When using strval(), implicit conversion or type-casting, floats are converted using locale-aware display formatting, rather than native formatting, as understood by most other software (and PHP itself). Please understand that this is a complex problem, which requires a lengthy analysis and many examples. I have spent almost 6 hours analyzing this problem in-depth, and created a complete report explaining the problem, suggesting changes, and recommending ways to implement these changes. Please, don't discard this report without careful consideration - there are fundamental problems with float-handling in PHP, which should be taken seriously. For the full description and examples, please see this page: http://public.test.fynskemedier.dk/float/ Thank You. Reproduce code: --------------- <?php setlocale(LC_NUMERIC, 'danish'); function ftos($f) { return is_float($f) ? sprintf('%.14F', $f) : 'NaN'; } $a = 1234.01234567890123456789; echo "accurate value: " . ftos($a) . "\n\n"; echo "casting float to string: "; $s = (string) $a; var_dump($s); echo "casting back to float: "; echo ftos( (float) $s ) . "\n\n"; ?> The above is a very simple example, demonstrating one of the issues most commonly encountered by beginning PHP developers. Please find many more examples and in-depth explanations below: http://public.test.fynskemedier.dk/float/ Expected result: ---------------- accurate value: 1234.01234567890128 casting float to string: string(19) "1234.01234567890128" casting back to float: 1234.01234567890128 Actual result: -------------- accurate value: 1234.01234567890128 casting float to string: string(13) "1234,01234568" casting back to float: 1234.00000000000000 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=45365&edit=1