$a = 5;$b = 6;echo '$a+$b';代码输入结果是什么?
A. 11
B. $a+$b
C. 5+6
D. 5
单选题】$fruit="apple"; echo 'this is an $fruit.'的输出结果是()
A. this is an $fruit.
B. this is an $apple.
C. this is an apple.
D. this is an .
【单选题】变量a的值为true,则a的数据类型是()
A. resource
B. bool
【单选题】$str="123avfdss234" $a=(int)$str,则变量a的类型是()
A. 字符串类型
B. 整型
C. 不能强制转换