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?
You create methods by declaring ________ within a PHP class definition.
Functions
The PHP statement $a = new classname("First"); denotes a(n):
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What is the default PHP class access modifier?
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Use the _________ keyword to specify that one class is to be a subclass of another.
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The object-oriented principle of ____________ means that different classes can have different behaviors for the same operation.
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________ are methods, actions, or functions that an object can perform to modify itself or perform some external effect.
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In object-oriented programming, __________ are properties or variables that relate to an object.
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Which of the following shows the correct use of the final PHP keyword?
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In PHP you can have __________ catch block(s) associated with a single try block.
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In PHP, the keyword __________ triggers the exception-handling mechanism.
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In PHP, the ________ block always is executed after the try and catch blocks.
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Which of the following shows the correct definition of a PHP exception?
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In PHP it's considered good coding practice to implement _______ try blocks in your code.
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Which of the following is NOT a built-in method of the Exception PHP class?
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Most of the public PHP exception methods are:
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A(n) __________ shows which functions were executing at the time the exception was raised.
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Which of the following is NOT a valid optional parameter of the PHP Exception class?
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In creating your own subclass Exceptions, you can override the ________ built-in function.
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What is the most commonly used type of database according to the book's authors?
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A primary key can consist of ___________ column(s).
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What is the definition of a relational database schema?
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Atomic column values mean that you store only _______ attribute(s) in each row.
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Having many _________ values in your database wastes space and causes problems working out totals.
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In a relational database table, each value must have the _____________ specified by its column.
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Which of the following is NOT an example of an update anomaly?
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In relational database theory, a table is also known as a:
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A foreign key should have the same or comparable _________ as its related primary key.
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In a database-backed PHP application, the _________ opens a connection to the web database.
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Which of the following is a valid MySQL connection command?
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The ___________ MySQL statement allows a specified database user to grant his or her own privileges to others.
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Which of the following MySQL privileges allows users to run stored procedures and functions?
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You can use a(n) ____________ as an alternative to implementing MySQL user passwords.
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LOCK TABLES is an example of a(n):
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How do you create a new MySQL database?
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Which of the following commands do you use to specify which MySQL database you want to use?
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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.