PHP 4.0 Bug #9260: Strange effects ...

From: stefan@digiconcept.net Operating system: Win NT, Service Pack 6, Apache 3.014, PHP as module PHP version: 4.0.4pl1 PHP Bug Type: Performance problem Bug description: Strange effects ... The following script only generates an array and walks through it with 2 different loops. There are some strange effects while watching the durations of the loops. 1. Sometimes loop 1 is faster 1. Sometimes loop 2 is faster 1. Sometimes there is a negativ duration ... ? PHP seems to behave in real bizarre way ... looks like it has a will of it's own ;-) <? function test() { for ($i=0;$i<30000;$i++) { $GLOBALS['myVar'][$i]=$i; } $a = microtime(); for ($i=0;$i<count($GLOBALS['myVar']);$i++) { $GLOBALS['myVar'][$i] = $GLOBALS['myVar'][$i] *2; } $b = microtime(); foreach($GLOBALS['myVar'] as $i => $d) { $GLOBALS['myVar'][$i] = $d * 2; } $c = microtime(); echo('Results ... <br>'); echo("<b>$a<br>$b<br>$c</b><br>"); list($m,$s)=explode(' ',$a);$a = doubleval($s)+doubleval($m); list($m,$s)=explode(' ',$b);$b = doubleval($s)+doubleval($m); list($m,$s)=explode(' ',$c);$c = doubleval($s)+doubleval($m); echo("<b>$a | $b | $c</b><br><br>"); echo("Loop 1: ".($b-$a)." seconds<br>"); echo("Loop 2: ".($c-$b)." seconds<br>"); echo("<hr>"); } test();test();test();test();test(); ?> -- Edit Bug report at: http://bugs.php.net/?id=9260&edit=1