我的代码的最后一行出了什么问题？

Question

The following code is for my University project. The last line has an error when I run as a web page ... I need help on how to solve this issue.

<?php
include_once 'ShapeClass.php';    
class Square extends Shape
      print "<h2>This square's side is not bigger than the parallelogram's height</h2>";
   }
break;
}
?>

Answer 1

The right way..

<?php
include_once 'ShapeClass.php';

class Square extends Shape
{
    function __construct()
    {
                print("<h2>This square's side is not bigger than the parallelogram's height</h2>");
    }
}

---

The mistakes you did

• There was an unnecessary break statement.
• You can't directly print as it is inside the class. You need to wrap that in a method.
• You forgot open a { after your class

Answer 2

Try this,

class Square extends Shape {
     function __construct() {
            print "<h2>This square's side is not bigger than the parallelogram's   height</h2>";
 }

}
?>

Answer 3

You might want to check the braces in your code, it looks quite haphazard.

include_once 'ShapeClass.php';

class Square extends Shape
{
    print "<h2>This square's side is not bigger than the parallelogram's height</h2>";
    break;
}

?>

Answer 4

There are many things wrong with this. First, a class code block is in the form

class MyClass extends OtherClass {
    // code for MyClass goes here
}

You don't even have an opening curly brace.

Second, there should not be arbitrary code placed inside of a class. Thus, the print_r() should not be placed directly inside the curly braces.

Third, if you are trying to stop execution, the break is incorrect in context. Since it is also arbitrary code, it should not be placed directly inside the curly braces. Also, it should probably be exit() .

I suggest reading 3 chapters on object oriented programming from Larry Ullman's book, http://www.larryullman.com/books/php-advanced-and-object-oriented-programming/ . Also, you might consider reading up on the fundamentals of object oriented php http://au2.php.net/oop5.basic .