Extract/Introduce variable
If you come across an expression that is hard to understand or it is duplicated in several places throughout your code, the Extract Variable refactoring Ctrl+Alt+V can help you deal with those problems placing the result of such expression or its part into a separate variable that is less complex and easier to understand. Plus, it reduces the code duplication.
In the editor, select an expression or its part that you want to extract. You can also place the caret within the expression, in this case PhpStorm offers you a list of potential code selections.
Press Ctrl+Alt+V or go to in the main menu.
Alternatively, on the toolbar that appears, click Extract and select Variable.
If PhpStorm finds more than one occurrence, it lets you specify a scope and extract just a part of the found occurrences and not just all of them. .
Select a name suggested in the popup or type your own and press Enter.
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.
PHP Example
Before | After |
|---|---|
public function getFeedObject($title, $description)
{
global $wgSitename, $wgContLanguageCode, $wgFeedClasses, $wgTitle;
if (!isset($wgFeedClasses[$this->format]))
return false;
return new $wgFeedClasses[$this->format]
("$wgSitename - {$title} [$wgContLanguageCode]", htmlspecialchars());
}
|
public function getFeedObject($title, $description)
{
global $wgSitename, $wgContLanguageCode, $wgFeedClasses, $wgTitle;
$feedTitle = "$wgSitename - {$title} [$wgContLanguageCode]";
if (!isset($wgFeedClasses[$this->format]))
return false;
return new $wgFeedClasses[$this->format]
($feedTitle, htmlspecialchars());
}
|