下面代码运行后输出的结果是()。$str="phper";$replace="mysql";echo substr_replace($str,$replace,1,2);
A. pmysqler
B. phpermysql
C. mysql
D. pmysql
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变量 $email的值是字符串 user@example.com ,以下哪项能把字符串转化成example.com?
A. substr($email, strpos($email, '@'));
B. strstr($email, '@')
C. strchr($email, '@')
D. substr($email, strpos($email, '@')+1)
MCGS系统函数前必须加()
A. ¥
B.
C. !
D. *
MCGS系统变量前必须加()
A. @
B. $
C. %
D. *
一下运算符中优先级最低的是()
A. ()
B. AND
C. NOT
D. +/-