Convert the PHP 5_tostring () method class to a string

Class testclass
{
Private $;
Private $ B;
Private $ C;

Public Function _ construct ($ A, $ B, $ c ){
$ This-> A = $;
$ This-> B = $ B;
$ This-> C = $ C;
}

Public Function _ tostring (){
Return $ this-> A. ''. $ this-> B.''. $ this-> C;
}
}

$ Class = new testclass ('good', 'morning, ', 'Sir! ');
Echo $ class;
?>

/*
In PhP5, You can implement a method named _ tostring () for the class to convert the class into a string.
When you try to print the instance of the class that implements the method, the __tostring () method is automatically called.
Before PHP 5.2.0, __tostring () is called only when the instance is directly output by ECHO () and print ().
*/