Req #52734 [NEW]: Extend hypot() to three dimensions

From: Operating system: Windows XP PHP version: 5.3.3 Package: Math related Bug Type: Feature/Change Request Bug description:Extend hypot() to three dimensions Description: ------------ The existing hypot() function is limited to finding the hypotenuse of a right-angled triangle in two dimensions ($h = hypot($x,$y)), when in fact it is well-defined for higher dimensions as well as the length of the diagonal of a (hyper)cuboid with edge lengths $x,$y,$z...; it's the square root of the sum of the squares of the edge lengths. For geometric purposes it would be helpful to have at least hypot($x,$y,$z). The existing alternatives are sqrt($x*$x+$y*$y+$z*$z) or hypot(hypot($x,$y),$z). The latter is (not surprisingly) markedly slower, and also less accurate. Test script: --------------- function length($v1, $v2) { return hypot($v1[0]-$v2[0], $v1[1]-$v2[1], $v1[2]-$v2[2]); } $v1 = array(1, 1, 1); $v2 = array(5, 6, 1); echo length($v1, $v2); Expected result: ---------------- 6.4031242374328 Actual result: -------------- A warning about hypot expecting exactly two parameters, and a NULL return value. -- Edit bug report at http://bugs.php.net/bug.php?id=52734&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=52734&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=52734&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=52734&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=52734&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52734&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=52734&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=52734&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=52734&r=needscript Try newer version: http://bugs.php.net/fix.php?id=52734&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=52734&r=support Expected behavior: http://bugs.php.net/fix.php?id=52734&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=52734&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=52734&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=52734&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52734&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=52734&r=dst IIS Stability: http://bugs.php.net/fix.php?id=52734&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=52734&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=52734&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=52734&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=52734&r=mysqlcfg