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

From: todd at magnifisites dot com Operating system: Any PHP version: 5.0.3 PHP Bug Type: Math related Bug description: abs returns zero for a (string) number between 0 and -1 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 bug report at http://bugs.php.net/?id=33581&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=33581&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=33581&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=33581&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=33581&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=33581&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=33581&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=33581&r=needscript Try newer version: http://bugs.php.net/fix.php?id=33581&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=33581&r=support Expected behavior: http://bugs.php.net/fix.php?id=33581&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=33581&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=33581&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=33581&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=33581&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=33581&r=dst IIS Stability: http://bugs.php.net/fix.php?id=33581&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=33581&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=33581&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=33581&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=33581&r=mysqlcfg