Re: could use some suggestions to speed this short piece of code up

2010/1/20 Rene Veerman <rene7705@gmail.com>: > this is at least 1000% faster > > the crux is that array()+=array() is way faster than any array_merge() > operations. > > global $hmGenKeys; > $hmGenKeys = 0; > function htmlMicroscope_generateRandomArray ($maxKeys, $maxDepth, > $maxDuration=-1) { >  global $hmGenKeys; >  if ($maxKeys!==null) { >    $hmGenKeys = $maxKeys; >  } > >  $hmGenKeys--; >  if ($hmGenKeys<=0) return false; >  if ($maxDepth==0) return false; >  srand(htmlMicroscope_randMakeSeed()); >  while ($hmGenKeys > 0) { >      $range = rand(0,40); >      file_put_contents('countdown.txt', $hmGenKeys); >      for ($i=0; $i<$range && $hmGenKeys>=0; $i++) { >        $hmGenKeys--; >        if ($maxDuration!=-1 && $maxDuration < getDuration()) { >          return false; >        } else { >            $r = array(); >            switch (rand(1,2)) { >              case 1 : >                $next = htmlMicroscope_generateRandomArray (null, > $maxDepth-1, $maxDuration); >                if ($next!==false) >                  $r +=  array( >                    htmlMicroscope_randomValue(3) => $next >                  ); >                break; >              case 2 : >                $r += array( >                  htmlMicroscope_randomValue(3) => htmlMicroscope_randomValue(20) >                ); >                break; >            } >        } >      } >  } >  return $r; > } > > function htmlMicroscope_randomValue($maxLength) { >  $r = ''; >  switch (rand(0,9)) { >    case 0 : $r = rand (0,100000000); break; >    case 1 : $r = rand (0,100000000) / rand(1,100) / 3; break; >    default: >        switch (rand(0,1)) { >          case 0: >            for ($i = 0; $i < $maxLength; $i++) { >              $r.= unichr(rand(0,hexdec('ffff'))); >            } >            break; >          case 1: >            for ($i = 0; $i < $maxLength; $i++) { >              $r.=chr(rand(ord('a'),ord('z')));; >            } >            break; >        } >        break; >  } >  //echo $r.'<br/>'.$maxLength.'<br/>'; >  return $r; > } > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > Also take a watch of the php|Architect webcast Jun 26 Matthew Turland New SPL Features in PHP 5.3. This covered the ArrayObject and ArrayAccess class/interface. When dealing with a LOT of data, this interface outperforms standard PHP array. http://www.phparch.com/webcasts http://mtadata.s3.amazonaws.com/webcasts/20090623-spl.wmv -- ----- Richard Quadling "Standing on the shoulders of some very clever giants!" EE : http://www.experts-exchange.com/M_248814.html Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 ZOPA : http://uk.zopa.com/member/RQuadling