when I want to statically access the class JSON using an variable it is possible.
Code:
<?php
$classname = "JSON";
$classname::echo_output();
?>
But when I want to use an object variable to statically access the class it fails. code:
<?php
class someclass{
public $classname = "JSON";
public function __construct(){
$this->classname::echo_output();
}
}
?>
Try it yourself.
How I solved it was $classname = $this->classname; But is there any other possible way to solve this?
You can use call_user_func function in order to achieve this
<?php
class someclass{
public $classname = "JSON";
public function __construct(){
call_user_func([$this->classname, 'echo_output']);
}
}
?>
If echo_output actually exists in the class your calling, this should work but you have to assign the property to a variable first.
public function __construct(){
$classname = $this->classname;
$classname::echo_output();
}
By PHP 5.4+ you can do this with ReflectionClass in a single line.
(new \ReflectionClass($this->classname))->getMethod('echo_output')->invoke(null);
under PHP 5.4
call_user_func(array($this->classname, 'echo_output'));
but I don't recommend this.
Instead of using static methods, you should create instances, inject them, and call their methods...
interface Helper{
public function echo_output();
}
class JSONHelper implements Helper {
...
}
class someclass{
public function __construct(Helper $helper){
$helper->echo_output();
}
}
new someclass(new JSONHelper()); //multiple instances
new someclass(JSONHelper::getInstance()); //singleton
new someclass($helperFactory->createHelper()); //factory
new someclass($container->getHelper()); //IoC container
By some research and javascript knowledge this solution would be the simpliest.
<?php
class someclass{
public $classname = "JSON";
public function __construct(){
$that = (array) $this;
$that["classname"]::echo_output();
}
}
?>
Just cast objects to arrays.
This way you don't have to define a variable for each dynamic classname.
JSONclass and have already solved the problem you were experiencing. Is there another issue you're having?