Function is a system keyword, which means defining a method, followed by a space, and then the root method name (__construct

Is the method name). Yours has no spaces.

__construct is a built-in system called magic method, which is automatically executed every time a class is instantiated.

There is also a call to a member variable of a class without adding a $ in front of the variable, such as:

$ this-& gt； School _ name = $ name correct.

$ this-& gt； Error in $ school _ name = $ name

& lt？ Server-side programming language (abbreviation of professional hypertext preprocessor)

Class school {

public $ school _ name

public $ school _ student

Public $ school _ room

Public $ school _ teacher

function __construct($name，$student，$room，$teacher) {

$ this-& gt； school _ name = $ name

$ this-& gt； school _ student = $ student

$ this-& gt； school _ room = $ room

$ this-& gt； School _ teacher = $ teacher;

}

Function display () {

Echo "! @#$%^&； *";

}

}

Class People's Development School {

public $ teachername

function __construct($tname，$studentconsts) {

$ this-& gt； Teacher name = $ tname

$ this-& gt； school _ student = $ studentconsts

}

Function display () {

Return to "Today's class". $ this-& gt； Teacher's name. Lecturer, student. $ this-& gt； School _ students. "people";

}

}

Tongji campus {

Function display () {

Return to "School Name:". $ this-& gt； Name of the school. Number of students. $ this-& gt； School _ students. Number of classrooms. $ this-& gt； School classrooms. Number of teachers. $ this-& gt； School _ teacher;

}

}

$a = Newcomer (Weekly Volume 20);

$b = new school ("DZ", 20, 50, 2);

echo $ a-& gt； Display (). “& ltbr >； ;

echo $ b-& gt； show()；

& gt