程嶏清单2-6.txt

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$fred = "pay";
$fredday = "wrong!";
$barney = "It's $fredday";   #$barney不是"It's payday!", 
                             #而是 "It's wrong!"
$barney = "It's ${fred}day";        #  现在$barney 是 "It's payday"
$barney2 = "It's $fred"."day";      # 同上
$barney3 = "It's " . $fred . "day";   # 同上