Which is faster ?

bazet · #1 (**permalink**) 27-09-2004, 09:56 AM

Comparison #1

PHP Code:


			
$data = ' Lorem ipsum ';

$data. =  ' danga bay ';

$data. = 'the lost empire of Troy ';

echo $data;

or

PHP Code:


			
$data[] = ' Lorem ipsum ';

$data[] =  ' danga bay ';

$data[] = 'the lost empire of Troy ';

echo implode("", $data);

Comparison #2

PHP Code:


			
echo "Lorem Ipsum";

or

PHP Code:


			
echo 'Lorem Ipsum';

Start learning write PHP for speed. These 2 examples show us how to achive speed in PHP.

Anyone have any URL for related topic ? ( Writing PHp for speed )..I just read it from ez Framework Documentation

MHR · #2 (**permalink**) 28-09-2004, 04:59 PM

comparison 1, #1 faster, comp 2, #2 faster

check sitepoint forums, ade sticky topic pasal php tips and stuff

mysticmind · #3 (**permalink**) 28-09-2004, 06:17 PM

1. 1 sebab dia direct.. takder baca pusing sana sini pecah sana sini trace sana sini.. dari var terus ke result

2.?
aku kompius apa sebenarnya beza antara " dengan ' .

lcf · #4 (**permalink**) 29-09-2004, 02:07 AM

the ' should be faster than " because it does not need to care about the variable in the string

MHR · #5 (**permalink**) 29-09-2004, 11:46 AM

yes. pandai lcf

lcf · #6 (**permalink**) 29-09-2004, 02:35 PM

LOL *kembang kembang*

Gemp-X · #7 (**permalink**) 29-09-2004, 06:08 PM

tambahan utk no 2: kalau nak guna variable dalam string kene guna ( " )

contoh

PHP Code:


			
$burung="Ayam";

echo " \t1: Selsema $burung\n ";

echo ' \t2: Selsema $burung\n ';

output :
1: Selsema Ayam
\t2: Selsema $burung\n

MHR · #8 (**permalink**) 29-09-2004, 06:44 PM

guna variable dalam string is a bad practise. elok escape dan guna single quote

lcf · #9 (**permalink**) 30-09-2004, 02:21 AM

a better way should be something like this:

PHP Code:


			
echo ' 2: Selsema' .  $burung;

Gemp-X · #10 (**permalink**) 30-09-2004, 01:56 PM

but if we want to use escape character like '\n' (newline) or '\t'(tab)we should use ( " ) .
if we use ( ' ) , we should manually use return(Enter) or tab key, to make newline or tab in the output

eg : both output will be

selsema
burung

PHP Code:


			
echo "selsema\n burung";



echo 'selsema

burung';

lcf · #11 (**permalink**) 30-09-2004, 06:19 PM

is it for webpages? I thought you will use <br /> for a new line?

Gemp-X · #12 (**permalink**) 30-09-2004, 08:49 PM

i mean output = html code (the source), not the output by browser, just to make our html tidy, with proper newline and tabbed

for instance

PHP Code:


			
echo "\nLorem ipsum dolor sit amet, <br /> \n consectetuer adipiscing elit.<br />\n Donec molestie";

html source produced will be:

Code:

Lorem ipsum dolor sit amet, <br />
consectetuer adipiscing elit. <br />
Donec molestie

of course the output by browser will be:

Lorem ipsum dolor sit amet,
consectetuer adipiscing elit.
Donec molestie

bazet · #13 (**permalink**) 01-10-2004, 10:15 AM

Comparison #1
=================
Aku rasa #2 faster than #1.Sebabya,
$data = " test";
$data .= "test2"; // ini akan consume more memory
so

Nih result dia :

http://cms.arl.net.my/fallujah/comparison.php

bazet · #14 (**permalink**) 01-10-2004, 10:23 AM

err..I was wrong

#1 is fater in comparison 1

Gemp-X · #15 (**permalink**) 01-10-2004, 11:05 AM

i think this comparison has some bias
cuba ubah kedudukan atas tukar bawah, result dia akan berbeza.
to ensure the result is not biased, run each in 2 different files

try modified code ni untuk comparison 1

PHP Code:


			
<?

/* mari kita lihat sapa yg laju */

function getmicrotime()

{

  list($usec, $sec) = explode(" ",microtime());

  return ((float)$usec + (float)$sec);

}



if ($_GET['type']==1||!isset($_GET['type'])){

echo '(using $data )<br>';



$script_start2 = getmicrotime();

$data = ' Lorem ipsum '; 

$data .=  ' danga bay ';

$data .= 'the lost empire of Troy ';

echo $data;

$script_end2=getmicrotime();

echo '<br>Time taken:' . sprintf("%.9f",($script_end2 - $script_start2)) . 'secs';



echo '<br><a href="'.$PHP_SELF.'?type=2" >satu lagi</a>';

unset($data);

unset($burung);

}elseif($_GET['type']==2){

echo '(using  $data[])<br>';



$script_start1 = getmicrotime();

$data[] = ' Lorem ipsum ';

$data[] =  ' danga bay ';

$data[] = 'the lost empire of Troy ';

echo implode("", $data);

$script_end1=getmicrotime();

echo '<br>Time taken:' . sprintf("%.9f",($script_end1 - $script_start1)) . 'secs';



echo '<br><a href="'.$PHP_SELF.'?type=1" >satu lagi</a>';

unset($data);

unset($burung);

}



?>

no 1
(using $data )
Lorem ipsum danga bay the lost empire of Troy
Time taken:0.000053167secs

no 2
(using $data[])
Lorem ipsum danga bay the lost empire of Troy
Time taken:0.000056982secs

#using $data[] implode a bit slower

(berapa banyak kali daa aku ubah,hehe. yang ni betul ni)