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I have followed a tutorial to create a simple blog writing application in PHP and have modified the classes in this tutorial so that they have additional capabilities. Modifying this very bare bones app has given me a better understanding of how PHP works, however I have run across an interesting situation.
One of the classes in my project has about a half dozen class properties such as public $id, public $author, public $post. These properties are declared at the beginning of this class however I find that if I remove all but one of these properties the app still functions correctly.
Is it wrong to remove a property declaration such as public $datePosted from the beginning of a class if this class still assigns variables to this property like this: $this->datePosted = $someVariableName;
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Introduction. Data members declared inside class are called properties. Property is sometimes referred to as attribute or field. In PHP, a property is qualified by one of the access specifier keywords, public, private or protected.
Here, we declare a static property: $value. Then, we echo the value of the static property by using the class name, double colon (::), and the property name (without creating a class first).
Note: A property declared without a Visibility modifier will be declared as public . Within class methods non-static properties may be accessed by using -> (Object Operator): $this->property (where property is the name of the property). Static properties are accessed by using the :: (Double Colon): self::$property .
If you try to access a class property which hasn't been declared, PHP will issue a notice:
class Foo { }
var $fu = new Foo();
echo $fu->baz;
Notice: Undefined property: Foo::$baz in blah.php on line 4
If you set a value first ($fu->baz = 'blah') then it won't complain, but that's not a great situation.
You should definitely declare all your class variables (unless of course you want to have some fun with the magic methods)...
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