Curly brackets

It all depends on your type of coding, but I for style I do prefer to put array data within a separate part of the echo statement, for example.

$arr = array("first" => 1, "second" =>2);
 
echo "this is the first value " . $arr["first"];

but of course you can put the arr object within the echo statement as long as you { .. } it out, which is kinder similar to using the ” . as such,

echo "this is the second value {$arr["second"]}";

both work, but because of the array object uses the “..” for the hash key, then you will need to use the { .. }