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Leveraging standard class objects

From: Object-Oriented Programming with PHP

Video: 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.

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. Echo

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.

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This video is part of

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Object-Oriented Programming with PHP

37 video lessons · 17640 viewers

Jon Peck
Author

 
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  1. 4m 10s
    1. Welcome
      39s
    2. Exercise files
      2m 16s
    3. What you should know
      1m 15s
  2. 7m 47s
    1. What is an object?
      2m 6s
    2. What is a class?
      2m 7s
    3. Why should you use object-oriented programming?
      2m 14s
    4. The history of object-oriented PHP
      1m 20s
  3. 16m 40s
    1. Defining a class
      2m 58s
    2. Defining class properties
      3m 26s
    3. Creating a method and exploring object context with $this
      2m 50s
    4. Instantiating an object and accessing its contents
      3m 19s
    5. Specifying the visibility scope
      4m 7s
  4. 15m 51s
    1. What is a magic method, and do I need one?
      2m 23s
    2. Overloading property access
      6m 37s
    3. Customizing object construction
      4m 34s
    4. Standardizing object rendering as a string
      2m 17s
  5. 20m 54s
    1. Using the static keyword
      3m 36s
    2. Leveraging scope resolution operators
      1m 10s
    3. Setting constant values
      2m 47s
    4. Implementing static methods
      5m 43s
    5. Creating a database class
      7m 38s
  6. 26m 19s
    1. Extending your class
      6m 8s
    2. Abstracting classes
      5m 57s
    3. Sharing interfaces using polymorphism
      4m 39s
    4. Overriding methods, properties, and constants
      3m 25s
    5. Cloning and comparing objects
      2m 51s
    6. Referencing objects
      3m 19s
  7. 14m 52s
    1. Leveraging standard class objects
      2m 42s
    2. Retrieving objects from the database
      5m 41s
    3. Error handling with exceptions
      2m 6s
    4. Customizing PHP exceptions
      4m 23s
  8. 8m 2s
    1. Identifying the singleton pattern
      1m 42s
    2. Using the factory method pattern
      1m 51s
    3. Implementing a strategy pattern
      4m 29s
  9. 2m 57s
    1. Looking forward to namespaces
      47s
    2. Next steps
      1m 6s
    3. Goodbye
      1m 4s

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