#33581 [Opn->Bgs]: abs returns zero for a (string) number between 0 and -1

ID: 33581 Updated by: sniper@php.net Reported By: todd at magnifisites dot com -Status: Open +Status: Bogus Bug Type: Math related Operating System: Any PHP Version: 5.0.3 New Comment: Works fine with latest CVS. Please don't report bugs if you can't reproduce them with the latest releases (including BETAs) and preferrably also with latest CVS snapshot(s). Previous Comments: ------------------------------------------------------------------------ [2005-07-06 01:10:00] todd at magnifisites dot com Description: ------------ abs() is returning zero (0) for a string representation of numbers between (but not including) 0 and -1. I realize that abs() operates on numeric values as opposed to strings but this value is coming from an ODBC result set and yes, I tried casting it to a numeric value first and it still returned the unexpected result of zero (0). Besides, the docs say it should work this way http://www.php.net/manual/en/language.types.string.php#language.types.string.conversion This is tested and confirmed for PHP version 4.3.9, 4.3.10, 5.0.3 but seems fixed in 5.0.4. However, I could not find any documentation noting so in the ChangeLogs nor in any bug reports. Originally, the $row['AMOUNT'] variable was coming from an ODBC result set which will return the value as type string according to a var_dump(). We are able to simulate the same by casting the variable as a number, then as a string to note the difference: Reproduce code: --------------- <pre> <?php // numeric value; this works: $row['AMOUNT'] = -.94; print abs($row['AMOUNT']) . "\n"; // string; these do not work: $row['AMOUNT'] = '-.94'; print abs($row['AMOUNT']) . "\n"; print abs($row['AMOUNT'] + 0) . "\n"; $amount = $row['AMOUNT'] + 0; print abs($amount) . "\n"; // string; this works: $amount = (float) $row['AMOUNT']; print abs($amount) . "\n"; ?> </pre> Expected result: ---------------- 0.94 0.94 0.94 0.94 0.94 Actual result: -------------- 0.94 0 0 0 0.94 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=33581&edit=1