Edit report at https://bugs.php.net/bug.php?id=64894&edit=1
ID: 64894 Updated by: s...@php.net Reported by: roberto at spadim dot com dot br Summary: information about speed -Status: Open +Status: Not a bug Type: Feature/Change Request Package: *General Issues Operating System: linux PHP Version: 5.4.15 Block user comment: N Private report: N New Comment: Please use an appropriate mail list to ask questions: http://php.net/mailing-lists.php Previous Comments: ------------------------------------------------------------------------ [2013-05-22 02:51:08] roberto at spadim dot com dot br Description: ------------ hi guys, could anyone explain this results? why a $array['string'] is slower to "++" operator and $array[0] and $class- >variable and $single_var and why a $var that point to anyone of this type of var $point=&$to_this_var; is faster than anyone? Test script: --------------- <?php class a{ var $t; } $array=array(0=>0,'t'=>0); $var=0; $class=new a; $qnt=10000000; $t1=microtime(1); for($i=0;$i<$qnt;$i++) $array['t']++; $t2=microtime(1); for($i=0;$i<$qnt;$i++) $array[0]++; $t3=microtime(1); for($i=0;$i<$qnt;$i++) $class->t++; $t4=microtime(1); for($i=0;$i<$qnt;$i++) $var++; $t5=microtime(1); echo "array with string index: ".($t2-$t1)."\n". "array with number index: ".($t3-$t2)."\n". "class public var: ".($t4-$t3)."\n". "var: ".($t5-$t4)."\n". ''; $array=array(0=>0,'t'=>0); $var=0; $class=new a; $qnt=10000000; $v1=&$array['t']; $v2=&$array[0]; $v3=&$a->t; $v4=&$var; $t1=microtime(1); for($i=0;$i<$qnt;$i++) $v1++; $t2=microtime(1); for($i=0;$i<$qnt;$i++) $v2++; $t3=microtime(1); for($i=0;$i<$qnt;$i++) $v3++; $t4=microtime(1); for($i=0;$i<$qnt;$i++) $v4++; $t5=microtime(1); echo "& array with string index: ".($t2-$t1)."\n". "& array with number index: ".($t3-$t2)."\n". "& class public var: ".($t4-$t3)."\n". "& var: ".($t5-$t4)."\n". ''; Expected result: ---------------- array with string index: 0.80007791519165 (at least sabe time as $array[0]) array with number index: 0.65114402770996 (why not faster like $var?) class public var: 0.5907871723175 (why not faster like $var?) var: 0.47185897827148 (why not faster like & $var?) & array with string index: 0.46768593788147 (why faster than a $var?!?!?!?!) & array with number index: 0.46670913696289 & class public var: 0.46836400032043 & var: 0.46757102012634 Actual result: -------------- array with string index: 0.80007791519165 array with number index: 0.65114402770996 class public var: 0.5907871723175 var: 0.47185897827148 & array with string index: 0.46768593788147 & array with number index: 0.46670913696289 & class public var: 0.46836400032043 & var: 0.46757102012634 system is only running me, it's linux with php, nothing less, nothing more downloaded slackware and php ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=64894&edit=1
