$public_var = "I am define out of any classes.";
class testA{
public function printMsg($msg)
{
global $public_var;
printf("public_var=%s\n",$public_var);
printf("%s,%s,%s:$msg\n",__FILE__,__FUNCTION__,__LINE__);
}
}
在类A的成员函数printMsg($msg)中访问全局变量$public_var时必须先用global申明一下。