Entry Level PHP Web Application Development/Our First Programs: Hello, World!/DQS-Answer
A double-quoted string (also known as a double-quoted string literal) has the purpose of including a string into a program, with variable substitution. For example, the string "$foo on you"
will appear as on you
if $foo
is not defined; if $foo
contains the value 'Poo'
, then the resulting string will appear as Poo on you
when output to the user’s web browser.