Jochem Maas wrote:
hi guys,
[[
I original posted this to php-internals because I figured that
php-general would not know the answer _ it had to do with intended use
of functionality (I couldn't find anything on the web about) and I
figured that the guys who wrote/write php would be best equipped to
answer. well no joy - the post was gloriously ignored, so I figured I
give it a shot here...
]]
I always use curly braces around vars placed in double quoted strings, I
do this for 2 reasons:
1. I believe It helps the engine because the var delimitation is
explicit, and this means the interpolation is (should be?) faster.
it's just as fast as not using it. The delimiter with variables is
simply the $[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]* part. Simple
variables (scalar) are described using the above, it doesn't make it
faster to put more around em. Adding {} around array's/objects shouldn't
make it faster, since it's still just taking the entire thing as a
variable until it comes acress a character that either delimits the
whole thing, or is simply not allowed there.
2. it looks nice (easier to read!)
I think it looks ugly... but it's a simple matter of personal taste ;)
I have tried to test this with a simple script that does a million
interations - but I cannot get it to return consistent results - one
time with curlies is faster, another its slower. the (php5) script I
used to test is included at the bottom of the email for those who are
curious. (I haven't been able to find relevant info on either google or
php.net - are there any other search engines? ;-)
I am interested in knowing whether my first assumption regarding speed
of interpolation is (in theory) at all correct.
If any of the php gurus would give advice as to use of curly braces in
interpolated strings would it be:
a, always use them (its faster/better)
b, only when absolutely necessary
c, go away troll and figure it out for yourself
(this one is tempting, n'est pas ;-)
d, something I haven't had the presence of mind to think of!
[[
choice c, is only relevant to internal btw :-)
]]
kind regards,
Jochem.
<?
class Tester
{
public $testvar;
}
$t = new Tester;
$t->testvar = 'superduper';
$a = array('junk' => 'notbad!');
var_dump($t, $a);
$strs = array();
$start = mktime();
$i = 0;
do {
$c = 'simplicity' + $i;
$strs[] = "{$t->testvar} yadda yadda {$a['junk']} - {$c}\n";
$i++;
} while ($i < 1000001);
$diff = (mktime() - $start);
echo "With Curlies - Total Time Taken ($diff): ".floor($diff / 60).'
mins & '.($diff % 60).' secs'."\n";
$strs = array();
$start = mktime();
$i = 0;
do {
$c = 'simplicity' + $i;
$strs[] = "$t->testvar yadda yadda $a[junk] - $c\n";
$i++;
} while ($i < 1000001);
$diff = (mktime() - $start);
echo "Without Curlies - Total Time Taken ($diff): ".floor($diff / 60).'
mins & '.($diff % 60).' secs'."\n";
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