PHP Welling Chapter 6-11 Flashcards

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Questions and Answers

In a PHP __________, you can group together functionality that may be reused in multiple classes.

Trait

Which of the following programming languages does NOT support true multiple inheritance?

PHP (correct)

Python

C++

Java

You create methods by declaring ________ within a PHP class definition.

Functions

The PHP statement $a = new classname("First"); denotes a(n):

Constructor Signup and view all the answers

What is the default PHP class access modifier?

Public Signup and view all the answers

Use the _________ keyword to specify that one class is to be a subclass of another.

Extends Signup and view all the answers

The object-oriented principle of ____________ means that different classes can have different behaviors for the same operation.

Polymorphism Signup and view all the answers

________ are methods, actions, or functions that an object can perform to modify itself or perform some external effect.

Operations Signup and view all the answers

In object-oriented programming, __________ are properties or variables that relate to an object.

Attributes Signup and view all the answers

Which of the following shows the correct use of the final PHP keyword?

final function operation() {} (C) Signup and view all the answers

In PHP you can have __________ catch block(s) associated with a single try block.

More than one Signup and view all the answers

In PHP, the keyword __________ triggers the exception-handling mechanism.

Throw Signup and view all the answers

In PHP, the ________ block always is executed after the try and catch blocks.

Finally Signup and view all the answers

Which of the following shows the correct definition of a PHP exception?

throw new Exception($message, $code); (B) Signup and view all the answers

In PHP it's considered good coding practice to implement _______ try blocks in your code.

Small Signup and view all the answers

Which of the following is NOT a built-in method of the Exception PHP class?

getString() (C) Signup and view all the answers

Most of the public PHP exception methods are:

Final Signup and view all the answers

A(n) __________ shows which functions were executing at the time the exception was raised.

Backtrace Signup and view all the answers

Which of the following is NOT a valid optional parameter of the PHP Exception class?

Stack trace (B) Signup and view all the answers

In creating your own subclass Exceptions, you can override the ________ built-in function.

toString() Signup and view all the answers

What is the most commonly used type of database according to the book's authors?

Relational Signup and view all the answers

A primary key can consist of ___________ column(s).

one or more Signup and view all the answers

What is the definition of a relational database schema?

Complete set of table designs Signup and view all the answers

Atomic column values mean that you store only _______ attribute(s) in each row.

1 Signup and view all the answers

Having many _________ values in your database wastes space and causes problems working out totals.

Null Signup and view all the answers

In a relational database table, each value must have the _____________ specified by its column.

data type Signup and view all the answers

Which of the following is NOT an example of an update anomaly?

Creation (D) Signup and view all the answers

In relational database theory, a table is also known as a:

Relation Signup and view all the answers

A foreign key should have the same or comparable _________ as its related primary key.

data type Signup and view all the answers

In a database-backed PHP application, the _________ opens a connection to the web database.

PHP engine Signup and view all the answers

Which of the following is a valid MySQL connection command?

mysql -h dbserver -u joe -p (A) Signup and view all the answers

The ___________ MySQL statement allows a specified database user to grant his or her own privileges to others.

WITH GRANT OPTION Signup and view all the answers

Which of the following MySQL privileges allows users to run stored procedures and functions?

EXECUTE (D) Signup and view all the answers

You can use a(n) ____________ as an alternative to implementing MySQL user passwords.

authentication plugin Signup and view all the answers

LOCK TABLES is an example of a(n):

administrator privilege (A) Signup and view all the answers

How do you create a new MySQL database?

create database dbname; Signup and view all the answers

Which of the following commands do you use to specify which MySQL database you want to use?

USE dbname; (D) Signup and view all the answers

Study Notes

PHP Traits and Inheritance

A PHP trait allows grouping of functionalities that can be reused across multiple classes, offering a method for code reuse without multiple inheritance.
PHP does not support true multiple inheritance unlike some other programming languages.
The extends keyword is used to declare a subclass inheriting properties and methods from a parent class.

PHP Methods and Access Modifiers

Methods in PHP are defined as functions within a class.
The default access modifier for PHP classes is public.

Object-Oriented Principles

Polymorphism allows different classes to implement the same method in varied ways.
Attributes in object-oriented programming represent properties or variables tied to an object.
Operations refer to methods or functions that an object can perform, affecting its state or external systems.

Exception Handling in PHP

A constructor is denoted by the syntax $a = new classname("First"); and initializes objects.
More than one catch block can be utilized with a single try block.
The throw keyword is essential for triggering exceptions in PHP.
The finally block executes after the try and catch processes, regardless of the outcome.
Custom exceptions can override the built-in function toString().

Database Concepts and Structures

The primary type of database emphasized is relational, which organizes data in structured tables.
A primary key can contain one or more columns, ensuring unique identification for each row.
The term relation refers to a table in relational database theory, highlighting the connection between data.

Data Integrity and Management

Atomic column values imply storing only one attribute per row, promoting data integrity.
Excess null values in databases can lead to inefficiencies and complications in data processing.
Each database value must adhere to the defined data type of its column.

MySQL Commands and Permissions

The command mysql -h dbserver -u joe -p establishes a MySQL connection.
WITH GRANT OPTION permits a database user to delegate their privileges to others.
The EXECUTE privilege is necessary for running stored procedures and functions in MySQL.
To create a new MySQL database, use the command create database dbname;.

General Coding Practices

Implementing small try blocks is recommended for better exception handling and code clarity.
The PHP Exception class lacks a built-in method named getString(), distinguishing it from possible expectations.
An exception backtrace provides a trace of the functions that were executing when an exception occurred, aiding debugging efforts.

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Description

Test your knowledge on PHP concepts with these flashcards from Chapter 6 to 11 of Welling's textbook. This quiz covers traits, inheritance, methods, and class definitions in PHP. Perfect for reinforcing your understanding of these fundamental programming concepts.