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Merge pull request #273 from simonrjones/fix/global-functions

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Removing \ from global functions
This commit is contained in:
Phil Sturgeon
2013-06-02 20:45:16 -07:00
parent 67ae0f80aa 4d2fcc80e7
commit 17c761d3fd
1 changed files with 5 additions and 5 deletions
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10
pages/Design-Patterns.md
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@@ -82,7 +82,7 @@ class Singleton
{
static $instance = null;
if (null === $instance) {
$instance = new static;
$instance = new static();
}
return $instance;
@@ -122,12 +122,12 @@ class SingletonChild extends Singleton
}
$obj = Singleton::getInstance();
\var_dump($obj === Singleton::getInstance()); // bool(true)
var_dump($obj === Singleton::getInstance()); // bool(true)
$anotherObj = SingletonChild::getInstance();
\var_dump($anotherObj === Singleton::getInstance()); // bool(false)
var_dump($anotherObj === Singleton::getInstance()); // bool(false)
\var_dump($anotherObj === SingletonChild::getInstance()); // bool(true)
var_dump($anotherObj === SingletonChild::getInstance()); // bool(true)
{% endhighlight %}
The code above implements the singleton pattern using a [*static* variable](http://php.net/language.variables.scope#language.variables.scope.static) and the static creation method `getInstance()`.
@@ -135,7 +135,7 @@ Note the following:
* The constructor [`__construct`](http://php.net/language.oop5.decon#object.construct) is declared as protected to prevent creating a new instance outside of the class via the `new` operator.
* The magic method [`__clone`](http://php.net/language.oop5.cloning#object.clone) is declared as private to prevent cloning of an instance of the class via the [`clone`](http://php.net/language.oop5.cloning) operator.
* The magic method [`__wakeup`](http://php.net/language.oop5.magic#object.wakeup) is declared as private to prevent unserializing of an instance of the class via the global function [`\unserialize()`](http://php.net/function.unserialize).
* The magic method [`__wakeup`](http://php.net/language.oop5.magic#object.wakeup) is declared as private to prevent unserializing of an instance of the class via the global function [`unserialize()`](http://php.net/function.unserialize).
* A new instance is created via [late static binding](http://php.net/language.oop5.late-static-bindings) in the static creation method `getInstance()` with the keyword `static`. This allows the subclassing of the class `Singleton` in the example.
The singleton pattern is useful when we need to make sure we only have a single instance of a class for the entire