问题
I tried this but couldn't get it to work:
class Profile extends CI_Controller {
public function index() {
$foo = 'bar';
}
public function form_submit() {
echo $this->index()->foo;
}
}
I know I can make a variable accessible to all the methods in a class by declaring it outside all the methods at class level and declaring it as public. But here I need to declare the variable inside one of the methods.
回答1:
If you are declaring it inside the method, you are out of luck unless you return the value.
class Profile {
public function index() {
$foo = 'bar';
return $foo;
}
public function form_submit() {
echo $this->index();
}
}
A perhaps better alternative would be to declare it as an object variable (what you describe as "at class level") but declare it private.
class Profile {
private $foo;
public function index() {
$this->foo = 'bar';
}
public function form_submit() {
echo $this->foo;
}
}
回答2:
No! In no case, one can image that accessing a variable in another method is useful or necessary.
A class is a collection of methods which operate on a shared state. The shared state gets created by instantiating an object of a class.
Since index() and form_submit() share the $foo state, your code should read like this:
class Profile extends CI_Controller {
private
$foo;
public function index() {
$this->foo = 'bar';
}
public function form_submit() {
echo $this->foo;
}
}
In certain situations, the registry pattern might be helpful. But not in your case.
Alternatively, you could lift $foo into the global scope. But since this is very bad style, I'm not willing to provide a code example. Sorry.
来源：https://stackoverflow.com/questions/8275294/how-to-access-variables-from-other-methods-inside-the-same-class-in-php