#46537 [NEW]: Incorrect addition of float and string

From: syphon dot and dot the dot trick at gmai dot com Operating system: Win32 / Linux PHP version: 5.2.6 PHP Bug Type: Strings related Bug description: Incorrect addition of float and string Description: ------------ I've been setting up our system to receive payments via Paypal. Paypal talks via IPN to a URL that I specify. In my code I have logic to verify the transaction. On one line I ran into the problem of addition when verifying transaction amounts. I have tried this test on Win32 running PHP 5.2.3 (Basic AppServ install) and on our live linux environment PHP 5.2.6 with both showing the same results. Reproduce code: --------------- $SubTotal = "67.43"; $Tax = "3.37"; $Amount = $SubTotal + $Tax; "<div>".var_dump($Amount)."</div>"; $Array = array("mc_gross" => "70.80"); echo ($Amount == $Array['mc_gross']) ? $Array['mc_gross'].' is equal to '.$Amount : 'These values are not equal. '.$Array['mc_gross']." is not equal to ".$Amount; echo '<br /><br />Second Test<br /><br />'; $Amount = 70.8; "<div>".var_dump($Amount)."</div>"; echo ($Amount == $Array['mc_gross']) ? $Array['mc_gross'].' is equal to '.$Amount : 'These values are not equal. '.$Array['mc_gross']." is not equal to ".$Amount; Expected result: ---------------- The variable mc_gross, a string with a string value "70.80" should equal the variable $Amount with the float value of 70.8 Actual result: -------------- The first test adds the two variables ($Subtotal and $Tax) together into the variable $Amount. Using var_dump php tells us that $Amount is a float with the value 70.8 When comparing that variable to the one supplied by Paypal (mc_gross) php says that the values are not equal to each other. If you redeclare the variable $Amount and with the value 70.8 and try again, php says the values are equal. var_dump confirms the variable types and value. -- Edit bug report at http://bugs.php.net/?id=46537&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=46537&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=46537&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=46537&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=46537&r=fixedcvs Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=46537&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=46537&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=46537&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=46537&r=needscript Try newer version: http://bugs.php.net/fix.php?id=46537&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=46537&r=support Expected behavior: http://bugs.php.net/fix.php?id=46537&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=46537&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=46537&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=46537&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46537&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=46537&r=dst IIS Stability: http://bugs.php.net/fix.php?id=46537&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=46537&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=46537&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=46537&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=46537&r=mysqlcfg