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About Me
- Name: Nigel Fernandes
- Location: Panjim, Goa, India
Crazy, dancing, programming, Goan.. I'm a computer geek and proud to be one. I program in Java, Ruby and .Net, PHP, Javascript. A lot of my recent work has been about CSS and UI design practices for large scale websites and Agile teams. I still while away hours dreaming up a web startup.
Interesting PHP function scoping caveat
Friday, February 29, 2008
While playing around a personal PHP project the other day I stumbled across some rather unsual PHP scope scenario. I was in the process of migrating some instance methods to static methods when I discovered the following:Lets look at the some PHP code first:
class BarClass {
public function readData () {
echo $this->data;
}
public static function readData2 () {
echo $this->data;
}
}
class FooClass {
public $data;
public function __construct ($parameter) {
$this->data = $parameter;
}
function testScope () {
BarClass::readData();
}
function testScopeFail() {
BarClass::readData2();
}
}
$myObj= new FooClass('Spooky Scope');
$myObj->testScope(); // Will print 'Spooky Scope'
$myObj->testScopeFail(); // Will throw an error
What is so intriguing in this little snippet of code is that I'm accidentally calling the BarClass method readData() statically, yet it has the $this instance variable defined within it ...and set to the calling scope!Amazing. I wonder what kind of interesting things I could conjure up with this.
I included the other method readData2() as part of this post because a static function if properly defined will throw an error. ;-)
Labels: PHP, PHP function scope
