Trivial question of execution speed

[jamesgoode]

Hi,

I'm trying to write fast code, and I'm wondering which is faster,
generating strings with double quotes or single quotes - aka, $string
= "My name is $name"; or $string = 'My name is '.$name;.

Also, if you have any tips for writing fast code, please share
them :-).

Thanks,

--James.

[=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=]

jamesgoode wrote:

I'm trying to write fast code, and I'm wondering which is faster,
generating strings with double quotes or single quotes - aka, $string
= "My name is $name"; or $string = 'My name is '.$name;.

There is no noticeable

Also, if you have any tips for writing fast code, please share
them :-).

Skip premature optimization altogether[1], and concentrate on programming
efficient algorithms[2][3].

[1]http://en.wikipedia.org/wiki/Optimization_(computer_science)#When_to_optimize
[2]http://en.wikipedia.org/wiki/Computational_complexity_theory
[3]http://en.wikipedia.org/wiki/Big_O_notation

In other words, how you concatenate strings won't be a bottleneck in your
application. Unindexed databases or unnefficient ways to
search/update/manipulate data will be.

--
----------------------------------
Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

Con tecnología AMANO(tm).

[Michael Fesser]

..oO(jamesgoode)

>I'm trying to write fast code, and I'm wondering which is faster,
generating strings with double quotes or single quotes - aka, $string
= "My name is $name"; or $string = 'My name is '.$name;.

$string = sprintf('My name is %s', $name);

Yes, I've seen cases where this was faster than a sinqle-quoted string
with concatenation.

The point is: You won't notice any difference unless you call this line
a billion times. Google "premature optimization".

>Also, if you have any tips for writing fast code, please share
them :-).

Get a profiler to find the real bottlenecks in your code, _then_ start
thinking about optimization. Usually this means to modify the algorithm,
not the used language constructs. A poorly written QuickSort will still
almost always be faster than a highly optimized BubbleSort.

Micha