Complex classes like Kirki_Output often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Kirki_Output, and based on these observations, apply Extract Interface, too.
| 1 | <?php | ||
| 15 | class Kirki_Output { | ||
| 16 | |||
| 17 | /** | ||
| 18 | * The Kirki configuration used in the field. | ||
| 19 | * | ||
| 20 | * @access protected | ||
| 21 | * @var string | ||
| 22 | */ | ||
| 23 | protected $config_id = 'global'; | ||
| 24 | |||
| 25 | /** | ||
| 26 | * The field's `output` argument. | ||
| 27 | * | ||
| 28 | * @access protected | ||
| 29 | * @var array | ||
| 30 | */ | ||
| 31 | protected $output = array(); | ||
| 32 | |||
| 33 | /** | ||
| 34 | * An array of the generated styles. | ||
| 35 | * | ||
| 36 | * @access protected | ||
| 37 | * @var array | ||
| 38 | */ | ||
| 39 | protected $styles = array(); | ||
| 40 | |||
| 41 | /** | ||
| 42 | * The value. | ||
| 43 | * | ||
| 44 | * @access protected | ||
| 45 | * @var string|array | ||
| 46 | */ | ||
| 47 | protected $value; | ||
| 48 | |||
| 49 | /** | ||
| 50 | * The class constructor. | ||
| 51 | * | ||
| 52 | * @access public | ||
| 53 | * @param string $config_id The config ID. | ||
| 54 | * @param array $output The output argument. | ||
| 55 | * @param string|array $value The value. | ||
| 56 | */ | ||
| 57 | 	public function __construct( $config_id, $output, $value ) { | ||
| 65 | |||
| 66 | /** | ||
| 67 | * If we have a sanitize_callback defined, apply it to the value. | ||
| 68 | * | ||
| 69 | * @param array $output The output args. | ||
| 70 | * @param string|array $value The value. | ||
| 71 | * | ||
| 72 | * @return string|array | ||
| 73 | */ | ||
| 74 | 	protected function apply_sanitize_callback( $output, $value ) { | ||
| 88 | |||
| 89 | /** | ||
| 90 | * If we have a value_pattern defined, apply it to the value. | ||
| 91 | * | ||
| 92 | * @param array $output The output args. | ||
| 93 | * @param string|array $value The value. | ||
| 94 | * @return string|array | ||
| 95 | */ | ||
| 96 | 	protected function apply_value_pattern( $output, $value ) { | ||
| 120 | |||
| 121 | /** | ||
| 122 | * If we have a value_pattern defined, apply it to the value. | ||
| 123 | * | ||
| 124 | * @param array $output The output args. | ||
| 125 | * @param string|array $value The value. | ||
| 126 | * @return string|array | ||
| 127 | */ | ||
| 128 | 	protected function apply_pattern_replace( $output, $value ) { | ||
| 176 | |||
| 177 | /** | ||
| 178 | * Parses the output arguments. | ||
| 179 | * Calls the process_output method for each of them. | ||
| 180 | * | ||
| 181 | * @access protected | ||
| 182 | */ | ||
| 183 | 	protected function parse_output() { | ||
| 240 | |||
| 241 | /** | ||
| 242 | * Parses an output and creates the styles array for it. | ||
| 243 | * | ||
| 244 | * @access protected | ||
| 245 | * @param array $output The field output. | ||
| 246 | * @param string $value The value. | ||
| 247 | * | ||
| 248 | * @return void | ||
| 249 | */ | ||
| 250 | 	protected function process_output( $output, $value ) { | ||
| 275 | |||
| 276 | /** | ||
| 277 | * Some CSS properties are unique. | ||
| 278 | * We need to tweak the value to make everything works as expected. | ||
| 279 | * | ||
| 280 | * @access protected | ||
| 281 | * @param string $property The CSS property. | ||
| 282 | * @param string $value The value. | ||
| 283 | * | ||
| 284 | * @return array | ||
| 285 | */ | ||
| 286 | 	protected function process_property_value( $property, $value ) { | ||
| 299 | |||
| 300 | /** | ||
| 301 | * Returns the value. | ||
| 302 | * | ||
| 303 | * @access protected | ||
| 304 | * @param string|array $value The value. | ||
| 305 | * @param array $output The field "output". | ||
| 306 | * @return string|array | ||
| 307 | */ | ||
| 308 | 	protected function process_value( $value, $output ) { | ||
| 314 | |||
| 315 | /** | ||
| 316 | * Exploses the private $styles property to the world | ||
| 317 | * | ||
| 318 | * @access protected | ||
| 319 | * @return array | ||
| 320 | */ | ||
| 321 | 	public function get_styles() { | ||
| 324 | } | ||
| 325 | 
If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check:
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