Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Jetpack_EU_Cookie_Law_Widget 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 Jetpack_EU_Cookie_Law_Widget, and based on these observations, apply Extract Interface, too.
| 1 | <?php | ||
| 18 | 	class Jetpack_EU_Cookie_Law_Widget extends WP_Widget { | ||
| 19 | /** | ||
| 20 | * EU Cookie Law cookie name. | ||
| 21 | * | ||
| 22 | * @var string | ||
| 23 | */ | ||
| 24 | public static $cookie_name = 'eucookielaw'; | ||
| 25 | |||
| 26 | /** | ||
| 27 | * Default hide options. | ||
| 28 | * | ||
| 29 | * @var array | ||
| 30 | */ | ||
| 31 | private $hide_options = array( | ||
| 32 | 'button', | ||
| 33 | 'scroll', | ||
| 34 | 'time', | ||
| 35 | ); | ||
| 36 | |||
| 37 | /** | ||
| 38 | * Default text options. | ||
| 39 | * | ||
| 40 | * @var array | ||
| 41 | */ | ||
| 42 | private $text_options = array( | ||
| 43 | 'default', | ||
| 44 | 'custom', | ||
| 45 | ); | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Default color scheme options. | ||
| 49 | * | ||
| 50 | * @var array | ||
| 51 | */ | ||
| 52 | private $color_scheme_options = array( | ||
| 53 | 'default', | ||
| 54 | 'negative', | ||
| 55 | ); | ||
| 56 | |||
| 57 | /** | ||
| 58 | * Default policy URL options. | ||
| 59 | * | ||
| 60 | * @var array | ||
| 61 | */ | ||
| 62 | private $policy_url_options = array( | ||
| 63 | 'default', | ||
| 64 | 'custom', | ||
| 65 | ); | ||
| 66 | |||
| 67 | /** | ||
| 68 | * Widget position options. | ||
| 69 | * | ||
| 70 | * @var array | ||
| 71 | */ | ||
| 72 | private $position_options = array( | ||
| 73 | 'bottom', | ||
| 74 | 'top', | ||
| 75 | ); | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Constructor. | ||
| 79 | */ | ||
| 80 | View Code Duplication | 		function __construct() { | |
| 96 | |||
| 97 | /** | ||
| 98 | * Enqueue scripts and styles. | ||
| 99 | */ | ||
| 100 | 		function enqueue_frontend_scripts() { | ||
| 101 | wp_enqueue_style( 'eu-cookie-law-style', plugins_url( 'eu-cookie-law/style.css', __FILE__ ), array(), JETPACK__VERSION ); | ||
| 102 | |||
| 103 | 			if ( ! class_exists( 'Jetpack_AMP_Support' ) || ! Jetpack_AMP_Support::is_amp_request() ) { | ||
| 104 | wp_enqueue_script( | ||
| 105 | 'eu-cookie-law-script', | ||
| 106 | Assets::get_file_url_for_environment( | ||
| 107 | '_inc/build/widgets/eu-cookie-law/eu-cookie-law.min.js', | ||
| 108 | 'modules/widgets/eu-cookie-law/eu-cookie-law.js' | ||
| 109 | ), | ||
| 110 | array(), | ||
| 111 | '20180522', | ||
| 112 | true | ||
| 113 | ); | ||
| 114 | } | ||
| 115 | } | ||
| 116 | |||
| 117 | /** | ||
| 118 | * Return an associative array of default values. | ||
| 119 | * | ||
| 120 | * These values are used in new widgets. | ||
| 121 | * | ||
| 122 | * @return array Default values for the widget options. | ||
| 123 | */ | ||
| 124 | 		public function defaults() { | ||
| 141 | |||
| 142 | /** | ||
| 143 | * Front-end display of the widget. | ||
| 144 | * | ||
| 145 | * @param array $args Widget arguments. | ||
| 146 | * @param array $instance Saved values from database. | ||
| 147 | */ | ||
| 148 | 		public function widget( $args, $instance ) { | ||
| 149 | /** | ||
| 150 | * Filters the display of the EU Cookie Law widget. | ||
| 151 | * | ||
| 152 | * @since 6.1.1 | ||
| 153 | * | ||
| 154 | * @param bool true Should the EU Cookie Law widget be disabled. Default to false. | ||
| 155 | */ | ||
| 156 | 			if ( apply_filters( 'jetpack_disable_eu_cookie_law_widget', false ) ) { | ||
| 157 | return; | ||
| 158 | } | ||
| 159 | |||
| 160 | $instance = wp_parse_args( $instance, $this->defaults() ); | ||
|  | |||
| 161 | |||
| 162 | 			if ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() ) { | ||
| 163 | require dirname( __FILE__ ) . '/eu-cookie-law/widget-amp.php'; | ||
| 164 | return; | ||
| 165 | } | ||
| 166 | |||
| 167 | $classes = array(); | ||
| 168 | $classes['hide'] = 'hide-on-' . esc_attr( $instance['hide'] ); | ||
| 169 | 			if ( 'negative' === $instance['color-scheme'] ) { | ||
| 170 | $classes['negative'] = 'negative'; | ||
| 171 | } | ||
| 172 | |||
| 173 | 			if ( 'top' === $instance['position'] ) { | ||
| 174 | $classes['top'] = 'top'; | ||
| 175 | } | ||
| 176 | |||
| 177 | 			if ( Jetpack::is_module_active( 'wordads' ) ) { | ||
| 178 | $classes['ads'] = 'ads-active'; | ||
| 179 | $classes['hide'] = 'hide-on-button'; | ||
| 180 | } | ||
| 181 | |||
| 182 | echo $args['before_widget']; | ||
| 183 | require( dirname( __FILE__ ) . '/eu-cookie-law/widget.php' ); | ||
| 184 | echo $args['after_widget']; | ||
| 185 | /** This action is already documented in modules/widgets/gravatar-profile.php */ | ||
| 186 | do_action( 'jetpack_stats_extra', 'widget_view', 'eu_cookie_law' ); | ||
| 187 | } | ||
| 188 | |||
| 189 | /** | ||
| 190 | * Back-end widget form. | ||
| 191 | * | ||
| 192 | * @param array $instance Previously saved values from database. | ||
| 193 | */ | ||
| 194 | 		public function form( $instance ) { | ||
| 212 | |||
| 213 | /** | ||
| 214 | * Sanitize widget form values as they are saved. | ||
| 215 | * | ||
| 216 | * @param array $new_instance Values just sent to be saved. | ||
| 217 | * @param array $old_instance Previously saved values from database. | ||
| 218 | * @return array Updated safe values to be saved. | ||
| 219 | */ | ||
| 220 | 		public function update( $new_instance, $old_instance ) { | ||
| 287 | |||
| 288 | /** | ||
| 289 | * Check if the value is allowed and not empty. | ||
| 290 | * | ||
| 291 | * @param string $value Value to check. | ||
| 292 | * @param array $allowed Array of allowed values. | ||
| 293 | * | ||
| 294 | * @return string $value if pass the check or first value from allowed values. | ||
| 295 | */ | ||
| 296 | View Code Duplication | 		function filter_value( $value, $allowed = array() ) { | |
| 303 | } | ||
| 304 | |||
| 305 | // Register Jetpack_EU_Cookie_Law_Widget widget. | ||
| 312 | 
It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: