Menu
(assume php5) consider
<?php $foo = 'some words'; //case 1 print "these are $foo"; //case 2 print "these are {$foo}"; //case 3 print 'these are ' . $foo; ?> Is there much of a difference between 1 and 2?
If not, what about between 1/2 and 3?
907
String concatenation is a little faster for a very small number of arguments, but requires more memory. After 20+ arguments concat is better by time and memory.
Let me say the reason that string concatenation is slow is because strings are immutable. This means every time you write "+=", a new String is created. This means the way you build up your string is in the worst case, O(n2).
Concatenate Many Strings using the Join As shown above, using the join() method is more efficient when there are many strings.
You can think of string concatenation as gluing strings together. And, you can think of string interpolation without strings as injecting strings inside of other strings.
The performance difference has been irrelevant since at least January 2012, and likely earlier:
Single quotes: 0.061846971511841 seconds Double quotes: 0.061599016189575 seconds Earlier versions of PHP may have had a difference - I personally prefer single quotes to double quotes, so it was a convenient difference. The conclusion of the article makes an excellent point:
Never trust a statistic you didn’t forge yourself.
(Although the article quotes the phrase, the original quip was likely falsely attributed to Winston Churchill, invented by Joseph Goebbels' propaganda ministry to portray Churchill as a liar:
Ich traue keiner Statistik, die ich nicht selbst gefälscht habe.
This loosely translates to, "I do not trust a statistic that I did not fake myself.")
185
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
