PHP Concatenation using {}

Question

Possible Duplicate:
curly braces in string

I still don't know what it's called. Like:

$name = 'xxx';

echo "This is a string {$name}";

What do you call that operation? Concatenating a variable using {} in to a string.

Thanks!

possible duplicate of [curly braces in string](http://stackoverflow.com/questions/2596837/curly-braces-in-string), [PHP Curly bracket, what's meaning in this code](http://stackoverflow.com/questions/4563728/php-curly-bracket-whats-meaning-in-this-code), — outis, Mar 20 '11 at 18:40

score 7 · Accepted Answer · answered Mar 20 '11 at 18:39

7

This is not concatenation ; this is variable interpolation ; see the Variable parsing section, in the PHP manual.

Basically, you can use any of the two following syntaxes :

echo "This is $variable";

Or :

echo "This is {$variable}";

And you'll get the same result in both cases -- except the second one allows for more complex expressions.

Concatenation would be something like this :

echo "This is my : " . $value;

Where the content of the variable $value is concatenated to the string, using the concatenation operator ..

answered Mar 20 '11 at 18:39

Pascal MARTIN

I've referred to this as string/variable expansion as well. Would this be correct? – Jared Farrish Mar 20 '11 at 18:41
By a loose definition of "concatenation" (appending one string to another) then jun's example is concatenation (as the interpolation is at the end), albeit not via the standard concat operator. – Matthew Mar 20 '11 at 18:44
The manual says "variable parsing" ; I generally say/hear "variable interpolation" ; https://secure.wikimedia.org/wikipedia/en/wiki/Variable_%28programming%29 seems to indicate that interpolation, substitution, and expansion are all valid terms. – Pascal MARTIN Mar 20 '11 at 18:44

score 2 · Answer 2 · answered Mar 20 '11 at 18:38

2

It's often called string or variable interpolation.

answered Mar 20 '11 at 18:38

Matthew

score 1 · Answer 3 · edited May 23 '17 at 12:07

1

Don't let the question itself throw you - this answer gives you exactly what you are looking for.

And it's not concatenating; this is concatenating:

$myvar = "This is a string ".$name; // <<< Notice I'm concatenating the variable
                                    //     using the . operator

edited May 23 '17 at 12:07

Community

answered Mar 20 '11 at 18:37

Jared Farrish

3 Answers3