I think you shouldn't be care much about it as I would call it with one
word - paranoia.
I have made these tests long ago and some are even present on
www.phpbeginner.com. Basically double quotes with one or two variables
in it is faster. Then goes concatenation via single quotes and dot. But,
the fastest of all is actually inline php (when you leave php with ?>
and return to it again wrote:
> Hey all, I was playing around this morning with a little test to decide
> whether string substitution is faster or slower than concatenation. I
> figured that, since printing variable values is one of the most common
> actions in a script finding which method is best would be important.
> I've been suspecting that string substitution was slower and have tried
> not to use it as a general rule of thumbs.
>
> I found it sort-of interesting that--at least according to my
> test--string substitution is significantly slower than concatenation by
> quite a bit (like 40%).
>
> Here's my script--let me know if you find any flaws that skew the
> results:
>
>
> $num_tries = 50;
>
> function print_microtime($t)
> {
> $t = explode (' ', $t);
> return number_format ($t[1]+$t[0], 10);
> }
> function print_microtime_diff($t1, $t2, &$res)
> {
> $t1 = explode (' ', $t1);
> $t2 = explode (' ', $t2);
>
> $res = ($t2[1] + $t2[0]) - ($t1[1] + $t1[0]);
>
> return number_format ($res, 10);
> }
>
>
> $start = microtime();
>
> $s = 'test string';
>
> for ($i = 0; $i < $num_tries; $i++)
> $a = 'test ' . $s . ' string';
>
> $end = microtime();
>
> echo "Normal concatenation\n";
> echo 'Start: ' . print_microtime($start) . "\n";
> echo 'End: ' . print_microtime($end) . "\n";
> echo 'Diff: ' . print_microtime_diff ($start, $end, $diff1) . "\n\n";
>
> $start = microtime();
>
> $s = 'test string';
>
> for ($i = 0; $i < $num_tries; $i++)
> $a = "test $s string";
>
> $end = microtime();
>
> echo "String substitution\n";
> echo 'Start: ' . print_microtime($start) . "\n";
> echo 'End: ' . print_microtime($end) . "\n";
> echo 'Diff: ' . print_microtime_diff ($start, $end, $diff2) . "\n\n";
>
> echo 'Difference in timing: ' . ($diff2 - $diff1) . ' (' . number_format
> (($diff2 - $diff1) / $diff1 * 100, 2) . "%)\n\n";
>
> ?>
>
>
>
>
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