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