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Interesting piece of php trivia

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  #1  
Old December 6th, 2002, 09:18 PM
CmdrDats CmdrDats is offline
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Interesting piece of php trivia
Did you know that foreach($ar as $key=>$val) {} is two times faster than the while(list($key,$val) = each($ar)) alternative? *gasp* i can't imagine why i insisted on using while(...) to iterate thru my arrays...
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Old December 7th, 2002, 01:41 AM
Matt Matt is offline
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RE: Interesting piece of php trivia
That is interesting..I guess the extra function calls just cause the overhead...here's my results:

Code:
foreach: 4.04250204563
while: 7.35851705074


php Code:
Original - php Code 
  1. <?php
  2.  
  3. function getmicrotime(){ 
  4.    list($usec, $sec) = explode(" ",microtime()); 
  5.    return ((float)$usec + (float)$sec); 
  6. } 
  7.  
  8. $data = array_fill(1,1000000,'foo');
  9.  
  10.  
  11. $time_start = getmicrotime();
  12. reset($data);
  13. foreach($data as $key=>$val);
  14. $time_end = getmicrotime();
  15. $time = $time_end - $time_start;
  16. echo "foreach: $time<br />n";
  17.  
  18. $time_start = getmicrotime();
  19. reset($data);
  20. while(list($key,$val) = each($data));
  21. $time_end = getmicrotime();
  22. $time = $time_end - $time_start;
  23. echo "while: $time<br />n";
  24.  
  25. ?>
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  #3  
Old December 7th, 2002, 01:54 AM
JWright JWright is offline
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RE: Interesting piece of php trivia
I thought I was just being lazy by using foreach()...

Josh
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Old December 7th, 2002, 02:07 AM
zombie zombie is offline
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RE: Interesting piece of php trivia
why is this so surprising to you? when some funcion is built in the language, it means that it is implemented in C, so it has to be faster.

php doesn't have to have so many functinos, especialy string and array functions, since all or most of them can be done in php, but one of the reasons it does, is because their implementation is oh-so-much-faster than in php...
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Old December 7th, 2002, 07:57 PM
CmdrDats CmdrDats is offline
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RE: Interesting piece of php trivia
i just found it strange, coz foreach() makes a copy of the array (so two foreach()'s inside each other working on the same array will work, and while() wont) so i assumed, quite wrongly, that it has to be slower than just resetting the array..

another cool thing is that with foreach() you don't have to use reset()..

yeah, i forgot to take into account the compiled code advantage ;) shoot me.
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Old December 7th, 2002, 08:17 PM
zombie zombie is offline
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RE: Interesting piece of php trivia
BANG!
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Old December 8th, 2002, 08:17 AM
CmdrDats CmdrDats is offline
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RE: Interesting piece of php trivia
ahh.. That feels much better, thanks.
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