On 8/11/07, AmirBehzad Eslami <behzad.eslami@xxxxxxxxx> wrote:
> Hi,
>
> FASTER CODE!
>
> This question involves Coding Style, Readability, Write-ability and
> Performance.
> Some people use the . operator to concat an string to a variable, some
> people use interpolation (embeding variable into string).
>
> =====================
> 1st Method (Concatenation)
> $str = 'My name is ' . $name;
>
> 2nd Method (Interpolation)
> $str = "My name is $name";
> =====================
>
> I know that the 1st Method is much faster, according to
> some benchmarks, which one of them is available
> in the book "Advanced PHP Programming, page 470".
>
> Could we consider the 1st Method as a "Best Practice", which offers
> better Performance?
>
> I know that the performance here is not very much, but is it
> considerable in a high-traffic website?
>
> Thank you in advanced for sharing your opinions,
> Behzad
>
Code readability is quite important when working with a team on a
project, and if you got for method 1 on things like this:
$str = '<a href="'.$url."'>';
It gets quite inreadable, having a double qoute next to a single quote.
while this looks much better:
$str = "<a href='$url'>";
I just did some benchmarks myself, and you can see that concatenation
is definitly a little bit fast, but it's only 2 seconds on 10 million
loops:
For 10,000,000 loops:
Concatenation single quote:5.62786102295
Concatenation double quote:5.63359999657
Interpolation:7.32201290131
Test code used:
<?php
$x = 0;
$str = '';
$add = '?';
$time[1] = microtime(TRUE);
for($x = 0; $x < 10000000; $x++) {
$str = '<a href="'.$add.'">';
}
$time[2] = microtime(TRUE);
$x = 0;
$str = '';
$add = '?';
$time[3] = microtime(TRUE);
for($x = 0; $x < 10000000; $x++) {
$str = "<a href='".$add."'>";
}
$time[4] = microtime(TRUE);
$x = 0;
$str = '';
$add = 'def';
$time[5] = microtime(TRUE);
for($x = 0; $x < 10000000; $x++) {
$str = "<a href='$add'>";
}
$time[6] = microtime(TRUE);
echo 'For 10,000,000 loops:';
echo '<br />Concatenation single quote:'.($time[2]-$time[1]);
echo '<br />Concatenation double quote:'.($time[4]-$time[3]);
echo '<br />Interpolation:'.($time[6]-$time[5]);
?>
Tijnema
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