PHP - concatenate or directly insert variables in string

I am wondering, What is the proper way for inserting PHP variables into a string? <br/><br/> **This way:**<br/> echo "Welcome ".$name."!" **Or this way:**<br/> echo "Welcome $name!" Both of these methods work in my `PHP v5.3.5`. The latter is shorter and simpler but I'm not sure if the first is better formatting or accepted as more proper.