You're right. There is a low benefit in performance. But I think it's valuable in high-traffic websites. Of course, we should consider a lot of thing to have a better performance, but Concatenation, IMO, is the best practice. Let me explain: َActually, the programmers' preference on readability and write-ability varies. I think that concatenation provides a more readable syntax, since it allows us to distinguish variables from plain strings very easily. Consider the following code: $str = 'My name is ' . $name . ' and I live in ' . $city; VS. $str = "My name is $name and I live in $city"; (You may view the above code in an Editor with syntax-highlighting capability for a better result). However, it is possible to offer opposite examples. In addition to the Performance on Speed, Concatenation uses less memory than Interpolation, as explained in PHP Manual. Take a look at the following URL: http://us2.php.net/manual/en/language.types.string.php Quote: Note: Parsing variables within strings uses more memory than string concatenation. When writing a PHP script in which memory usage is a concern, consider using the concatenation operator (.) rather than variable parsing Thus, I think that it is better to use Concatenation instead of Interpolation. Since it provides Performance, both on Speed and Memory Usage. There is a benchmark available here: http://us2.php.net/manual/en/function.print.php#66392 On 8/11/07, Tijnema <tijnema@xxxxxxxxx> wrote: > > 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 > > -- > Vote for PHP Color Coding in Gmail! -> http://gpcc.tijnema.info >
