Bug #77197 [NEW]: rounding problem

From: php_bug at sport-sachsenhausen dot de Operating system: Linux PHP version: 7.2.12 Package: *Math Functions Bug Type: Bug Bug description:rounding problem Description: ------------ rounding function not as expected Test script: --------------- # tested PHP 5.2, 5.3, 5.4, 5.5, 5.6, 7.0, 7.2.12 for( $i = 0; $i < 100; $i += 0.001 ) { $r_0 = round( $i ); $r_up = round( $i, 2, PHP_ROUND_HALF_UP ); $r_down = round( $i, 2, PHP_ROUND_HALF_DOWN ); # a) missing values # Line 7- 8: 0,085 + 0,095 # Line 73-74: 0,765 - 0,995 # Line 78-79: 1,055 - 4,965 # Line 81-82: 5,005 - 9,795 # Line 83-84: 9,825 - 18,755 # Line 92-93: 18,855 - 38,885 # Line 97-98: 38,945 - 76,225 # Line 101+ : 76,235 - 99,995 if( $r_up == $r_down ) continue; // comment out... -> attention! producing 99.999 lines # see lines: 1.461 - 4.836, 5.137 - 9.723, 9.905 - 10.000, 10.717 - 18.396, # 19.215 - 38.703, 39.133 - 76.139, 76.349 - 99.999 echo 'Line ' . $count++ . "| {$i} | round 0: {$r_0} | half up: {$r_up} | half down: {$r_down} <br>"; } -- Edit bug report at https://bugs.php.net/bug.php?id=77197&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77197&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77197&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77197&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77197&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77197&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77197&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77197&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77197&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77197&r=support Expected behavior: https://bugs.php.net/fix.php?id=77197&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77197&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77197&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77197&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77197&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77197&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77197&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77197&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77197&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77197&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77197&r=mysqlcfg