选择填空, 使程序输出“ World”<?php$Hello="World";$a="Hello";echoa;?>$$hello$$
选择填空, 使程序输出“ World”<?php$Hello="World";$a="Hello";echoa;?>$$hello$$
1
选择填空, 使程序输出“ World”<?php$Hello="World";$a="Hello";echoa;?>$$hello$$