Bug #74534 [NEW]: 123

From: uchihasv at yandex dot ru Operating system: Windows 7 x64 PHP version: 7.1.4 Package: *General Issues Bug Type: Bug Bug description:123 Description: ------------ I have array with numbers and i do simple math in loop and in results i see -6.9388939039072E-17 instead 0 Test script: --------------- <?php $h = 0.05; $x = [-1,-0.5,0,0.5,1]; for($i=0;$i<4;$i++) { for($j=$x[$i]+$h;$j<$x[$i+1];$j+=$h) { $x2[$i][] = $j; } } echo "<pre>".print_r($x2,1)."</pre>"; Expected result: ---------------- Array ( [0] => Array ( [0] => -0.95 [1] => -0.9 [2] => -0.85 [3] => -0.8 [4] => -0.75 [5] => -0.7 [6] => -0.65 [7] => -0.6 [8] => -0.55 ) [1] => Array ( [0] => -0.45 [1] => -0.4 [2] => -0.35 [3] => -0.3 [4] => -0.25 [5] => -0.2 [6] => -0.15 [7] => -0.1 [8] => -0.05 [9] => 0 ) [2] => Array ( [0] => 0.05 [1] => 0.1 [2] => 0.15 [3] => 0.2 [4] => 0.25 [5] => 0.3 [6] => 0.35 [7] => 0.4 [8] => 0.45 [9] => 0.5 ) [3] => Array ( [0] => 0.55 [1] => 0.6 [2] => 0.65 [3] => 0.7 [4] => 0.75 [5] => 0.8 [6] => 0.85 [7] => 0.9 [8] => 0.95 ) ) Actual result: -------------- Array ( [0] => Array ( [0] => -0.95 [1] => -0.9 [2] => -0.85 [3] => -0.8 [4] => -0.75 [5] => -0.7 [6] => -0.65 [7] => -0.6 [8] => -0.55 ) [1] => Array ( [0] => -0.45 [1] => -0.4 [2] => -0.35 [3] => -0.3 [4] => -0.25 [5] => -0.2 [6] => -0.15 [7] => -0.1 [8] => -0.05 [9] => -6.9388939039072E-17 ) [2] => Array ( [0] => 0.05 [1] => 0.1 [2] => 0.15 [3] => 0.2 [4] => 0.25 [5] => 0.3 [6] => 0.35 [7] => 0.4 [8] => 0.45 [9] => 0.5 ) [3] => Array ( [0] => 0.55 [1] => 0.6 [2] => 0.65 [3] => 0.7 [4] => 0.75 [5] => 0.8 [6] => 0.85 [7] => 0.9 [8] => 0.95 ) ) -- Edit bug report at https://bugs.php.net/bug.php?id=74534&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74534&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74534&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74534&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=74534&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=74534&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=74534&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=74534&r=needscript Try newer version: https://bugs.php.net/fix.php?id=74534&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=74534&r=support Expected behavior: https://bugs.php.net/fix.php?id=74534&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=74534&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=74534&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=74534&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74534&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=74534&r=dst IIS Stability: https://bugs.php.net/fix.php?id=74534&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=74534&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=74534&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=74534&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=74534&r=mysqlcfg