$name = 'Travis'; //you could assign a vairable with double qoutes also
echo "hi there, $name, '!'";/*using single qoutes would have printed the variable as is, using double howver is said to process slower*/
//ex. echo 'hi there, $name'; would have printed '$name', instead of the intended value
echo 'hello, ', $name, "!";//a way to include a variable within a single quote.