PHP Welling Chapter 6-11 Flashcards
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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):

    <p>Constructor</p> Signup and view all the answers

    What is the default PHP class access modifier?

    <p>Public</p> Signup and view all the answers

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

    <p>Extends</p> Signup and view all the answers

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

    <p>Polymorphism</p> Signup and view all the answers

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

    <p>Operations</p> Signup and view all the answers

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

    <p>Attributes</p> Signup and view all the answers

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

    <p>final function operation() {}</p> Signup and view all the answers

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

    <p>More than one</p> Signup and view all the answers

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

    <p>Throw</p> Signup and view all the answers

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

    <p>Finally</p> Signup and view all the answers

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

    <p>throw new Exception($message, $code);</p> Signup and view all the answers

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

    <p>Small</p> Signup and view all the answers

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

    <p>getString()</p> Signup and view all the answers

    Most of the public PHP exception methods are:

    <p>Final</p> Signup and view all the answers

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

    <p>Backtrace</p> Signup and view all the answers

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

    <p>Stack trace</p> Signup and view all the answers

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

    <p>toString()</p> Signup and view all the answers

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

    <p>Relational</p> Signup and view all the answers

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

    <p>one or more</p> Signup and view all the answers

    What is the definition of a relational database schema?

    <p>Complete set of table designs</p> Signup and view all the answers

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

    <p>1</p> Signup and view all the answers

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

    <p>Null</p> Signup and view all the answers

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

    <p>data type</p> Signup and view all the answers

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

    <p>Creation</p> Signup and view all the answers

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

    <p>Relation</p> Signup and view all the answers

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

    <p>data type</p> Signup and view all the answers

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

    <p>PHP engine</p> Signup and view all the answers

    Which of the following is a valid MySQL connection command?

    <p>mysql -h dbserver -u joe -p</p> Signup and view all the answers

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

    <p>WITH GRANT OPTION</p> Signup and view all the answers

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

    <p>EXECUTE</p> Signup and view all the answers

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

    <p>authentication plugin</p> Signup and view all the answers

    LOCK TABLES is an example of a(n):

    <p>administrator privilege</p> Signup and view all the answers

    How do you create a new MySQL database?

    <p>create database dbname;</p> Signup and view all the answers

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

    <p>USE dbname;</p> 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.

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