Leveraging standard class objects
Video: Leveraging standard class objectsIn this chapter, I'm going to explore built-in PHP objects. I'll start with the standard class, which is pretty generic, then demonstrate how to get objects from the database. We'll handle errors in an object-oriented way, then customize them to meet our needs. Let's start with the standard class. A standard class is a generic class that can be created by typecasting a value as an object, like casting the string "hello, world" as an object. It won't have any methods, but it will have values. In case you were wondering, if you typecast an object to an object, that's kind of goofy, and nothing will happen.
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Whether you're enhancing or optimizing existing code or just starting from scratch, there's never a better time to start integrating object-oriented design techniques. This course shows how to integrate the principles of object-oriented programming into the build of a PHP-driven web page or application. After an overview of what objects and classes are and why they should be used, author Jon Peck dives into creating and instantiating objects, then defining the class relationships and interactions that will form the basis of your coding arsenal. The course also shows how to leverage PHP objects and implement design patterns, and looks at steps you can take to continue adding to your programming tool belt.
- Historical overview of object-oriented PHP
- Defining classes
- Creating a method/object context with $this
- Accessing classes without instantiation
- Creating a database class
- Extending and abstracting classes
- Cloning and comparing objects
- Error handling with exceptions
- Implementing design patterns, such as the factory and strategy patterns
Leveraging standard class objects
In this chapter, I'm going to explore built-in PHP objects. I'll start with the standard class, which is pretty generic, then demonstrate how to get objects from the database. We'll handle errors in an object-oriented way, then customize them to meet our needs. Let's start with the standard class. A standard class is a generic class that can be created by typecasting a value as an object, like casting the string "hello, world" as an object. It won't have any methods, but it will have values. In case you were wondering, if you typecast an object to an object, that's kind of goofy, and nothing will happen.
If you typecast that array to an object, the result will be an object with
properties named for the keys to the array, with values corresponding to the array values.
Let's clean up the demo, and remove the cloning tests.
Create a test standard class object out of a nested array.
Testing typecasting to an object>.
$test_object = (object). This is the typecasting. array. hello as the key and
world as the value. Then nested as an array ( 'key => value').
Then, debug the test object. Save, then refresh your browser. The result will be a standard class with properties "hello" and "nested," with nested containing an array. If I was to typecast any other data type like a string, the value would be converted to a standard object, with one property named scalar. Return to the demo, and replace the array definition with the number 12345. Save, and refresh.
The test object now has one property, scalar, with the value 12345. Standard class objects are practically used in a number of ways. For example, returning a defined data structure with fixed branches without nesting. Sometimes, it's used as a shorthand to speed code development, as it takes less characters to access a property than it does to specify a key. Finally, you can use a standard object when interacting with a method that is looking for an object with particular properties, but isn't actually checking for the class.
In the next video, I will show you how to load objects directly from the database, then intelligently load addresses from the database into the correct class.
Find answers to the most frequently asked questions about Object-Oriented Programming with PHP .
Here are the FAQs that matched your search "" :
- Q: I'm not seeing warnings or errors in my environment like the video; why not?
- A: Your PHP configuration is probably configured not to show them to you. This is often true on commercial web hosts and is often the default. Fortunately, there are multiple ways of resolving this.
The easiest way would be to explicitly enable error reporting at the top of the PHP script you wish to debug.
error_reporting(E_ALL | E_STRICT);
Alternatively, if you have access to your php.ini file and you want to always have error reporting on, change error_reporting = to a development friendly value of
error_reporting = E_ALL | E_STRICT
then change display_errors = to
display_errors = On
Finally, if access to the php.ini file is not available, you can add the following directives to your .htaccess or VirtualHost configuration for Apache:
php_value error_reporting 32767
php_value display_errors 1
If you would like a development optimized development environment like the one utilized in this course, see Up and Running with Linux for PHP Developers, here in the lynda.com online training library.
Q: This course was updated on 4/10/2013. What changed?
A: The author rerecorded some of the tutorials to add more background information and better graphics.
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