Function existing

Question

Okay, i have little MVC what works like

somesite/classname/classfunction/function

class test(){
 public function test2(){
 // action will be 'function' in adress
 $action = $this->action ? $this->action : array($this, 'test3');
 function test3(){
 print 1;
 }
 $action();
 }
}

So, if we run somesite/test/test2/test3 it will print '1', but if we run somesite/test/test2/phpinfo it will show phpinfo.
Question: how to check existing of function in class function ?

UPD
Don't forget about phpinfo, function_exists will show it. method_exists search in class functions, but not in functions of class function
UPD Solution

class test{
 public function test2(){
 // site/test/test2/test3
 $tmpAction = $this->parenter->actions[1]; // test3 
 $test3 = function(){
 print 1;
 };
 if(isset($$tmpAction)){
 $$tmpAction();
 }else{
 $this->someDafaultFunc();
 }
 }
}

• Yang: Functions inside the class called METHODS. So, inside the class, simply - if (method_exists($this, 'methodName'))
• deceze: That test3 inside test2 cannot be invoked using array($this, 'test3'). You should avoid functions within functions. Hoping it's just a bad copy-n-paste example.
• Yang: @deceze avoid functions inside functions in general, or in php ?
• deceze: @metal PHP obviously. In other languages functions within functions are a core design pattern. Note I also don't mean anonymous functions. I mean bare, global, conditional function declarations inside another function.
• Bart Friederichs: php.net/manual/en/function.get-defined-functions.php gives me defined functions. Nicely grouped to system and user. That's a way to weed phpinfo out. Still, I'd use method_exists and make test3 a class method to make it clean OOP.

Answer 1

http://php.net/function-exists

http://php.net/method-exists

if ( function_exists('function_name') ) {
 // do something
}
if ( method_exists($obj, 'method_name') ) { /* */ }

You should also check out the magic method __call()

Answer 2

To check whether a certain method in a class exists, use: http://php.net/method-exists

 $c = new SomeClass();
 if (method_exists($c, "someMethod")) {
 $c->someMethod();
 }

You are also allowed to use the class name:

 if (method_exists("SomeClass", "someMethod")) {
 $c = new SomeClass();
 $c->someMethod();
 }

To "fix" your problem, make test3() a class method:

class test(){
 private function test3() {
 print 1;
 }
 public function test2(){
 // action will be 'function' in adress
 $action = $this->action ? $this->action : array($this, 'test3');
 if (method_exists($this, $action)) {
 $this->$action();
 } else {
 echo "Hey, you cannot call that!";
 }
 }
}

• Abyss: i dont need to use test3 as method of class, only as function of class method.
• Abyss: bcz if it will be a class method it will be as function and can be called from MVC structure like /test/test3
• Bart Friederichs: @Abyss Ah. I get it. Perhaps you should explain that in the question.
• Bart Friederichs: @Abyss: also if you declare it private ?
• Bart Friederichs: I was getting there as well, but my PHP install didn't have anonymous functions, so my testbed didn't work ;-). You could answer your own question if you want.

Answer 3

class test{
 public function test2(){
 // site/test/test2/test3
 $tmpAction = $this->parenter->actions[1]; // test3 
 $test3 = function(){
 print 1;
 };
 if(isset($$tmpAction)){
 $$tmpAction();
 }else{
 $this->someDafaultFunc();
 }
 }
}

• Bart Friederichs: Note that anonymous functions are supported from PHP 5.3.0.