下列程序的运行结果是（）。class student{function _construct(){echo "I am a student .<br>";}function teacher(){echo "I am a teacher";}}$per=new student(); A: I am a studentI am a teacher B: I am a student C: I am a teacher D: 无任何输出
下列程序的运行结果是（）。class student{function _construct(){echo "I am a student .<br>";}function teacher(){echo "I am a teacher";}}$per=new student(); A: I am a studentI am a teacher B: I am a student C: I am a teacher D: 无任何输出
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