$str="ab" $str2="cd"$str.=$str2 (10分)
A. "ab"
B. "abcd"
C. "acbd"
D. cd
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$fruit="apple"; echo 'this is an $fruit.'的输出结果是() (5分)
A. this is an $fruit.
B. this is an $apple.
C. this is an apple.
D. this is an .
变量a的值为true,则a的数据类型是() (5分)
A. 对象
B. 数组
C. resource
D. bool
$a=4 $n=9 $a+=$n则$n的输出结果为() (10分)
A. 5
B. 4
C. 9
D. 13
$a=90,$b=3 $a%=$b,$a的值为() (10分)
A. 90
B. 3
C. 0
D. 1