which one is faster
in [General]
|
From: saeed ahmed on 5 Oct 2010 15:23 $a = 'hey'; $b = 'done'; $c = $a.$b; $c = "$a$b"; which one is faster for echo $c.
From: chris h on 5 Oct 2010 15:28 Benchmark and find out! :) What are you using this for? Unless you are doing something crazy it probably doesn't matter, and you should pick whichever you feel looks nicer / is easier to code in / etc. Chris H. On Tue, Oct 5, 2010 at 3:23 PM, saeed ahmed <saeed.sas(a)gmail.com> wrote: > $a = 'hey'; > $b = 'done'; > > $c = $a.$b; > $c = "$a$b"; > > which one is faster for echo $c. >
From: Ashley Sheridan on 5 Oct 2010 15:35 On Tue, 2010-10-05 at 15:28 -0400, chris h wrote: > Benchmark and find out! :) > > What are you using this for? Unless you are doing something crazy it > probably doesn't matter, and you should pick whichever you feel looks nicer > / is easier to code in / etc. > > Chris H. > > On Tue, Oct 5, 2010 at 3:23 PM, saeed ahmed <saeed.sas(a)gmail.com> wrote: > > > $a = 'hey'; > > $b = 'done'; > > > > $c = $a.$b; > > $c = "$a$b"; > > > > which one is faster for echo $c. > > As far as I'm aware, the first of the two will be faster, but only just. As Saeed mentioned, the difference will be negligible, and unless you plan to run a line like that in a loop or something hundreds of thousands of times, you probably won't notice any difference. Thanks, Ash http://www.ashleysheridan.co.uk
From: chris h on 5 Oct 2010 15:43 Saeed here's a quick (and dirty) test I ran: $tests = 1000000; $start = microtime(true); for ($i=0; $i<$tests; $i++) { $a = md5( rand() ); $b = md5( rand() ); $c = $a.$b; } var_dump( "By concat op:\t". (microtime(true) - $start) ); $start = microtime(true); for ($i=0; $i<$tests; $i++) { $a = md5( rand() ); $b = md5( rand() ); $c = "$a$b"; } var_dump( "By string:\t\t". (microtime(true) - $start) ); Sample results: string(30) "By concat op: 2.1713118553162" string(27) "By string: 2.2525599002838" string(30) "By concat op: 2.2123351097107" string(27) "By string: 2.2798750400543" string(29) "By concat op: 2.1521489620209" string(27) "By string: 2.2470209598541" string(29) "By concat op: 2.1347990036011" string(27) "By string: 2.1982681751251" I would say that under virtually all cases that difference is less then negligible. Chris H. On Tue, Oct 5, 2010 at 3:35 PM, Ashley Sheridan <ash(a)ashleysheridan.co.uk>wrote: > On Tue, 2010-10-05 at 15:28 -0400, chris h wrote: > > Benchmark and find out! :) > > What are you using this for? Unless you are doing something crazy it > probably doesn't matter, and you should pick whichever you feel looks nicer > / is easier to code in / etc. > > Chris H. > > On Tue, Oct 5, 2010 at 3:23 PM, saeed ahmed <saeed.sas(a)gmail.com> wrote: > > > $a = 'hey'; > > $b = 'done'; > > > > $c = $a.$b; > > $c = "$a$b"; > > > > which one is faster for echo $c. > > > > > As far as I'm aware, the first of the two will be faster, but only just. As > Saeed mentioned, the difference will be negligible, and unless you plan to > run a line like that in a loop or something hundreds of thousands of times, > you probably won't notice any difference. > Thanks, > Ash > http://www.ashleysheridan.co.uk > > >
From: Steve Staples on 5 Oct 2010 15:46
On Tue, 2010-10-05 at 20:35 +0100, Ashley Sheridan wrote: > On Tue, 2010-10-05 at 15:28 -0400, chris h wrote: > > > Benchmark and find out! :) > > > > What are you using this for? Unless you are doing something crazy it > > probably doesn't matter, and you should pick whichever you feel looks nicer > > / is easier to code in / etc. > > > > Chris H. > > > > On Tue, Oct 5, 2010 at 3:23 PM, saeed ahmed <saeed.sas(a)gmail.com> wrote: > > > > > $a = 'hey'; > > > $b = 'done'; > > > > > > $c = $a.$b; > > > $c = "$a$b"; > > > > > > which one is faster for echo $c. > > > > > > As far as I'm aware, the first of the two will be faster, but only just. > As Saeed mentioned, the difference will be negligible, and unless you > plan to run a line like that in a loop or something hundreds of > thousands of times, you probably won't notice any difference. > Thanks, > Ash > http://www.ashleysheridan.co.uk > > to be proper, shouldn't it technically be $c = "{$a}{$b}"; ?? Steve. |