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1 | <?php |
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2 | |||
3 | namespace Amarkal\Settings; |
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4 | |||
5 | class Manager |
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6 | { |
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7 | /** |
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8 | * @var Singleton The reference to *Singleton* instance of this class |
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9 | */ |
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10 | private static $instance; |
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11 | |||
12 | private $pages = array(); |
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13 | |||
14 | private $subpages = array(); |
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15 | |||
16 | /** |
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17 | * Returns the *Singleton* instance of this class. |
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18 | * |
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19 | * @return Singleton The *Singleton* instance. |
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20 | */ |
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21 | public static function get_instance() |
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22 | { |
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23 | if( null === static::$instance ) |
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0 ignored issues
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show
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24 | { |
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25 | static::$instance = new static(); |
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0 ignored issues
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show
Since
$instance is declared private, accessing it with static will lead to errors in possible sub-classes; consider using self , or increasing the visibility of $instance to at least protected.
Let’s assume you have a class which uses late-static binding: class YourClass
{
private static $someVariable;
public static function getSomeVariable()
{
return static::$someVariable;
}
}
The code above will run fine in your PHP runtime. However, if you now create a
sub-class and call the class YourSubClass extends YourClass { }
YourSubClass::getSomeVariable(); // Will cause an access error.
In the case above, it makes sense to update class SomeClass
{
private static $someVariable;
public static function getSomeVariable()
{
return self::$someVariable; // self works fine with private.
}
}
![]() It seems like
new static() of type this<Amarkal\Settings\Manager> is incompatible with the declared type object<Amarkal\Settings\Singleton> of property $instance .
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. ![]() |
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26 | } |
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27 | return static::$instance; |
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0 ignored issues
–
show
Since
$instance is declared private, accessing it with static will lead to errors in possible sub-classes; consider using self , or increasing the visibility of $instance to at least protected.
Let’s assume you have a class which uses late-static binding: class YourClass
{
private static $someVariable;
public static function getSomeVariable()
{
return static::$someVariable;
}
}
The code above will run fine in your PHP runtime. However, if you now create a
sub-class and call the class YourSubClass extends YourClass { }
YourSubClass::getSomeVariable(); // Will cause an access error.
In the case above, it makes sense to update class SomeClass
{
private static $someVariable;
public static function getSomeVariable()
{
return self::$someVariable; // self works fine with private.
}
}
![]() The expression
static::$instance; of type Amarkal\Settings\Manager...rkal\Settings\Singleton adds the type Amarkal\Settings\Manager to the return on line 27 which is incompatible with the return type documented by Amarkal\Settings\Manager::get_instance of type Amarkal\Settings\Singleton .
![]() |
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28 | } |
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29 | |||
30 | public function add_page($args) |
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31 | { |
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32 | $slug = $args['slug']; |
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33 | if(array_key_exists($slug,$this->pages)) |
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34 | { |
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35 | throw new \RuntimeException("A page with slug '$slug' has already been registered"); |
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36 | } |
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37 | $this->pages[$slug] = new Page($args); |
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38 | } |
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39 | |||
40 | public function add_subpage($args) |
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41 | { |
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42 | $this->subpages[] = new SubPage($args); |
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43 | } |
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44 | |||
45 | public function register_settings() |
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46 | { |
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47 | register_setting( 'myoption-group', 'new_option_name' ); |
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48 | register_setting( 'myoption-group', 'some_other_option' ); |
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49 | register_setting( 'myoption-group', 'option_etc' ); |
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50 | } |
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51 | |||
52 | public function register_scripts() |
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53 | { |
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54 | \wp_register_style('amarkal-settings',$this->get_url(__DIR__.'/assets/css/style.min.css')); |
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55 | } |
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56 | |||
57 | /** |
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58 | * Private constructor to prevent instantiation |
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59 | */ |
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60 | private function __construct() |
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61 | { |
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62 | $this->init(); |
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63 | } |
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64 | |||
65 | private function init() |
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66 | { |
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67 | \add_action('admin_init',array($this,'register_scripts')); |
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68 | } |
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69 | |||
70 | private function get_url( $path ) |
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71 | { |
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72 | $url = str_replace( ABSPATH, '', $path ); |
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73 | return esc_url_raw( site_url( $url ) ); |
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74 | } |
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75 | } |
Let’s assume you have a class which uses late-static binding:
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()
on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClass
to useself
instead: