Extract method

The Extract Method refactoring lets you take a code fragment that can be grouped, move it into a separated method, and replace the old code with a call to the method.

In the JavaScript context, this refactoring always results in a function.

In the PHP context, the result of applying the Extract Method refactoring depends on the location of the selected code fragment:

If the selection is made inside a method of a class, the refactoring extracts a method.
If the selection is made inside a function or a script, the refactoring extracts a function.

Extract method

Select a code fragment you want to extract to a method.
Press Ctrl+Alt+M or go to Refactor | Extract | Method in the main menu.
Alternatively, on the floating toolbar that appears when a code fragment is selected, click Extract and select Method.
Press Enter to apply the change.
By default, this extract refactoring will be applied in the editor via in-line controls. To change your settings to apply the refactoring via a modal, open the Settings dialog (Ctrl+Alt+S) , go to Editor | Code Editing, and in the Refactorings area select In modal dialogs.

Extract PHP method example

public function init()
{
    $this->_router = $this->getFrontController()->getRouter();
}
                           

public function init()
{
    $this->_router = $this->getRouter();
}

/**
 * @return mixed
 */
public function getRouter()
{
    return $this->getFrontController()->getRouter();
}
                           

Extract PHP function example

                        if ('POST' != $_SERVER['REQUEST_METHOD']) {
                            header('Allow: POST');
                            header('HTTP/1.1 405 Method Not Allowed');
                            header('Content-Type: text/plain');
                            exit;
                        }
                    

                        function printEmptyHeader()
                        {
                            header('Allow: POST');
                            header('HTTP/1.1 405 Method Not Allowed');
                            header('Content-Type: text/plain');
                        }

                        if ('POST' != $_SERVER['REQUEST_METHOD'])
                        {
                            printEmptyHeader();
                            exit;
                        }
                    

Code examples

Before	After
private func setupUI() { // ... // This code will be extracted to a method self.buttonLogin.layer.borderColor = UIColor.black.cgColor self.buttonLogin.layer.borderWidth = 1.0 self.buttonLogin.setTitleColor(UIColor.black, for: .normal) self.buttonLogin.setTitle("Login", for: .normal) }	private func setupUI() { // ... // Extracted method's call setupLoginButton() } // Extracted method private func setupLoginButton() { self.buttonLogin.layer.borderColor = UIColor.black.cgColor self.buttonLogin.layer.borderWidth = 1.0 self.buttonLogin.setTitleColor(UIColor.black, for: .normal) self.buttonLogin.setTitle("Login", for: .normal) }

Before	After
- (void)setupUI { // ... // This code will be extracted to a method self.buttonLogin.layer.borderColor = [[UIColor blackColor] CGColor]; self.buttonLogin.layer.borderWidth = 1.0; [self.buttonLogin setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [self.buttonLogin setTitle:@"Login" forState:UIControlStateNormal]; }	- (void)setupUI { // ... // Extracted method's call [self setupLoginButton]; } // Extracted method - (void)setupLoginButton { self.buttonLogin.layer.borderColor = [[UIColor blackColor] CGColor]; self.buttonLogin.layer.borderWidth = 1.0; [self.buttonLogin setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [self.buttonLogin setTitle:@"Login" forState:UIControlStateNormal]; }

Last modified: 16 August 2024