Examples of php class extension and inheritance usage

Examples of php class extension and inheritance usage

This article describes the extension and inheritance usage of php classes. Share it with you for your reference. The details are as follows:

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<? Php Class Thread { Var $ topic; // post topic Var $ body; // post content Var $ date; // Post posting time Var $ author; // post author // Function Thread is used to initialize variables. Function Thread () { // Initialize the variable } // The function Send is used to submit a new post. Function Send () { // Check the validity of the variable and perform the insert operation to store the variable in the database. } // Function Edit is used to Edit a post Function Edit () { // Check the validity of the variable and perform the update operation to store the variable in the database. } // The Delete function is used to Delete a post. Function Delete () { // After checking the permissions of the author, the relevant data will be deleted from the database. } } Class MainThread extends Thread { Var $ id; // post id Var $ board; // the forum where the post is located Var $ allowreply; // whether to allow replies // Constructor, used to initialize Variables Function MainThread ($ id, $ board, $ allowreply) { // Used to initialize Variables } Function Send () { // Check the validity of the variable and perform the insert operation to store the variable in the database. Parent: Send (); // call the Send function of the base class. } Function Edit () { // Check the validity of the variable and perform the update operation to store the variable in the database. Parent: Edit (); // used to call the Edit function of the base class } } $ Th = new Thread; // create a new object If ($ th instanceof Thread) // if the object $ th is of the Thread type, the output is Yes Echo "Yes "; Else Echo "No "; ?>

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