Examples of extensions and inheritance usages of PHP classes _php tutorial

Source: Internet
Author: User

Examples of extensions and inheritance usages for PHP classes


The examples in this article describe the extension and inheritance usage of PHP classes. Share to everyone for your reference. Specific as follows:

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Class Thread

{

var $topic; Post Topic

var $body; Post Content

var $date; Post release time

var $author; Post author

function thread for initializing variables, etc.

function Thread ()

{

Initialize variables

}

function Send to submit a new post

function Send ()

{

To detect the legality of a variable and perform an insert operation to store the variable in the database

}

function edit for editing posts

function Edit ()

{

Perform update operation after checking the legality of variables store variables in the database

}

function Delete to delete a post

function Delete ()

{

When the author's permissions are detected, the relevant data is deleted from the database

}

}

Class Mainthread extends Thread

{

var $id; Post Number

var $board; The discussion area where the post is located

var $allowreply; Whether to allow replies

constructors, for initializing variables

function Mainthread ($id, $board, $allowreply)

{

Used to initialize variables

}

function Send ()

{

To detect the legality of a variable and perform an insert operation to store the variable in the database

Parent::send (); The Send function that is used to call the base class

}

function Edit ()

{

Perform update operation after checking the legality of variables store variables in the database

Parent::edit (); The edit function to call the base class

}

}

$th = new Thread; Create a new object

if ($th instanceof thread)//If the object $th is of type thread, output Yes

echo "Yes";

Else

echo "No";

?>

I hope this article is helpful to everyone's PHP programming.

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