PHP variable interpolation vs concatenation [duplicate]

问题

This question already has an answer here:

• Should I use curly brackets or concatenate variables within strings? 3 answers

What is the difference between the two following methods (performance, readability, etc.) and what do you prefer?

echo \"Welcome {$name}s!\"

vs.

echo \"Welcome \".$name.\"!\";

回答1:

Whatever works best for you works... But if you want to go for speed use this:

echo 'Welcome ', $name, '!';

The single quotes tell PHP that no interpretation is needed, and the comma tells PHP to just echo the string, no concatenation needed.

来源：https://stackoverflow.com/questions/16790501/php-variable-interpolation-vs-concatenation