insideout10 / wordlift-plugin

src/admin/WL_Metabox/class-wl-metabox-field.php

Indentation +326 added lines, -326 removed lines

@@ -19,339 +19,339 @@
  */
 class WL_Metabox_Field {
 
-	/**
-	 * A {@link Wordlift_Log_Service} instance.
-	 *
-	 * @since  3.15.0
-	 * @access protected
-	 * @var \Wordlift_Log_Service $log A {@link Wordlift_Log_Service} instance.
-	 */
-	protected $log;
-
-	/**
-	 * The meta name for this field's value.
-	 *
-	 * @var string $meta_name The meta name for this field's value.
-	 */
-	public $meta_name;
-
-	/**
-	 * The custom field settings.
-	 *
-	 * @var null|array $raw_custom_field The custom field settings.
-	 */
-	public $raw_custom_field;
-
-	/**
-	 * The schema.org predicate.
-	 *
-	 * @var string $predicate The schema.org predicate.
-	 */
-	public $predicate;
-
-	/**
-	 * The field's label.
-	 *
-	 * @var string $label The field's label.
-	 */
-	public $label;
-
-	/**
-	 * The WordLift data type.
-	 *
-	 * @var string $expected_wl_type The WordLift data type.
-	 */
-	public $expected_wl_type;
-
-	/**
-	 * The RDF data type.
-	 *
-	 * @var string $expected_uri_type The RDF data type.
-	 */
-	public $expected_uri_type;
-
-	/**
-	 * The cardinality.
-	 *
-	 * @var int $cardinality The cardinality.
-	 */
-	public $cardinality;
-
-	/**
-	 * The current value.
-	 *
-	 * @var array $data The current value.
-	 */
-	public $data;
-
-	/**
-	 * Create a {@link WL_Metabox_Field} instance.
-	 *
-	 * @param array $args An array of parameters.
-	 */
-	public function __construct( $args ) {
-
-		$this->log = Wordlift_Log_Service::get_logger( 'WL_Metabox_Field' );
-
-		if ( empty( $args ) ) {
-			return;
-		}
-
-		// Save a copy of the custom field's params.
-		$this->raw_custom_field = reset( $args );
-
-		// Extract meta name (post_meta key for the DB).
-		$this->meta_name = key( $args );
-
-		// Extract linked data predicate.
-		if ( isset( $this->raw_custom_field['predicate'] ) ) {
-			$this->predicate = $this->raw_custom_field['predicate'];
-		} else {
-			return;
-		}
-
-		// Extract human readable label.
-		$exploded_predicate = explode( '/', $this->predicate );
-
-		// Use the label defined for the property if set, otherwise the last part of the schema.org/xyz predicate.
-		$this->label = isset( $this->raw_custom_field['metabox']['label'] ) ? $this->raw_custom_field['metabox']['label'] : end( $exploded_predicate );
-
-		// Extract field constraints (numerosity, expected type).
-		// Default constaints: accept one string..
-		if ( isset( $this->raw_custom_field['type'] ) ) {
-			$this->expected_wl_type = $this->raw_custom_field['type'];
-		} else {
-			$this->expected_wl_type = Wordlift_Schema_Service::DATA_TYPE_STRING;
-		}
-
-		$this->cardinality = 1;
-		if ( isset( $this->raw_custom_field['constraints'] ) ) {
-
-			$constraints = $this->raw_custom_field['constraints'];
-
-			// Extract cardinality.
-			if ( isset( $constraints['cardinality'] ) ) {
-				$this->cardinality = $constraints['cardinality'];
-			}
-
-			// Which type of entity can we accept (e.g. Place, Event, ecc.)? .
-			if ( Wordlift_Schema_Service::DATA_TYPE_URI === $this->expected_wl_type && isset( $constraints['uri_type'] ) ) {
-				$this->expected_uri_type = is_array( $constraints['uri_type'] )
-					? $constraints['uri_type']
-					: array( $constraints['uri_type'] );
-			}
-		}
-
-	}
-
-	/**
-	 * Return nonce HTML.
-	 *
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 */
-	public function html_nonce() {
-
-		return wp_nonce_field( 'wordlift_' . $this->meta_name . '_entity_box', 'wordlift_' . $this->meta_name . '_entity_box_nonce', true, false );
-	}
-
-	/**
-	 * Verify nonce.
-	 *
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 *
-	 * @return boolean Nonce verification.
-	 */
-	public function verify_nonce() {
-
-		$nonce_name   = 'wordlift_' . $this->meta_name . '_entity_box_nonce';
-		$nonce_verify = 'wordlift_' . $this->meta_name . '_entity_box';
-
-		if ( ! isset( $_POST[ $nonce_name ] ) ) {
-			return false;
-		}
-
-		// Verify that the nonce is valid.
-		return wp_verify_nonce( $_POST[ $nonce_name ], $nonce_verify );
-	}
-
-	/**
-	 * Load data from DB and store the resulting array in $this->data.
-	 *
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 */
-	public function get_data() {
-
-		$data = get_post_meta( get_the_ID(), $this->meta_name );
-
-		// Values are always contained in an array (makes it easier to manage cardinality).
-		if ( ! is_array( $data ) ) {
-			$data = array( $data );
-		}
-
-		$this->data = $data;
-	}
-
-	/**
-	 * Sanitizes data before saving to DB. Default sanitization trashes empty
-	 * values.
-	 *
-	 * Stores the sanitized values into $this->data so they can be later processed.
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 *
-	 * @param array $values Array of values to be sanitized and then stored into
-	 *                      $this->data.
-	 */
-	public function sanitize_data( $values ) {
-
-		$sanitized_data = array();
-
-		if ( ! is_array( $values ) ) {
-			$values = array( $values );
-		}
-
-		foreach ( $values as $value ) {
-			$sanitized_value = $this->sanitize_data_filter( $value );
-			if ( ! is_null( $sanitized_value ) ) {
-				$sanitized_data[] = $sanitized_value;
-			}
-		}
-
-		$this->data = $sanitized_data;
-	}
-
-	/**
-	 * Sanitize a single value. Called from $this->sanitize_data. Default
-	 * sanitization excludes empty values.
-	 *
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 *
-	 * @param string $value The value to sanitize.
-	 *
-	 * @return mixed Returns sanitized value, or null.
-	 */
-	public function sanitize_data_filter( $value ) {
-
-		// TODO: all fields should provide their own sanitize which shouldn't
-		// be part of a UI class.
-
-		// If the field provides its own validation, use it.
-		if ( isset( $this->raw_custom_field['sanitize'] ) ) {
-			return call_user_func( $this->raw_custom_field['sanitize'], $value );
-		}
-
-		if ( ! is_null( $value ) && '' !== $value ) {         // do not use 'empty()' -> https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/ .
-			return $value;
-		}
-
-		return null;
-	}
-
-	/**
-	 * Save data to DB.
-	 *
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 *
-	 * @param array $values Array of values to be sanitized and then stored into $this->data.
-	 */
-	public function save_data( $values ) {
-
-		// Will sanitize data and store them in $field->data.
-		$this->sanitize_data( $values );
-
-		$entity_id = get_the_ID();
-
-		// Take away old values.
-		delete_post_meta( $entity_id, $this->meta_name );
-
-		// insert new values, respecting cardinality.
-		$single = ( 1 === $this->cardinality );
-		foreach ( $this->data as $value ) {
-			add_post_meta( $entity_id, $this->meta_name, $value, $single );
-		}
-	}
-
-	/**
-	 * Returns the HTML tag that will contain the Field. By default the we
-	 * return a <div> with data- attributes on cardinality and expected types.
-	 *
-	 * It is useful to provide data- attributes for the JS scripts.
-	 *
-	 * Overwrite this method in a child class to obtain custom behaviour.
-	 */
-	public function html_wrapper_open() {
-
-		return "<div class='wl-field' data-cardinality='$this->cardinality'>";
-	}
-
-	/**
-	 * Returns Field HTML (nonce included).
-	 *
-	 * Overwrite this method (or methods called from this method) in a child
-	 * class to obtain custom behaviour.
-	 */
-	public function html() {
-
-		// Open main <div> for the Field.
-		$html = $this->html_wrapper_open();
-
-		// Label.
-		$html .= "<h3>$this->label</h3>";
-
-		// print nonce.
-		$html .= $this->html_nonce();
-
-		// print data loaded from DB.
-		$count = 0;
-		if ( $this->data ) {
-			foreach ( $this->data as $value ) {
-				if ( $count < $this->cardinality ) {
-					$html .= $this->html_input( $value );
-				}
-				$count ++;
-			}
-		}
-
-		// Print the empty <input> to add new values.
-		if ( 0 === $count ) { // } || $count < $this->cardinality ) { DO NOT print empty inputs unless requested by the editor since fields might support empty strings.
-			$html .= $this->html_input( '' );    // Will print an empty <input>.
-			$count ++;
-		}
-
-		// If cardiality allows it, print button to add new values.
-		if ( $count < $this->cardinality ) {
-			$html .= '<button class="button wl-add-input wl-button" type="button">Add</button>';
-		}
-
-		// Close the HTML wrapper.
-		$html .= $this->html_wrapper_close();
-
-		return $html;
-	}
-
-	/**
-	 * Return a single <input> tag for the Field.
-	 *
-	 * @param mixed $value Input value.
-	 *
-	 * @return string The html code fragment.
-	 */
-	public function html_input( $value ) {
-		$html = <<<EOF
+    /**
+     * A {@link Wordlift_Log_Service} instance.
+     *
+     * @since  3.15.0
+     * @access protected
+     * @var \Wordlift_Log_Service $log A {@link Wordlift_Log_Service} instance.
+     */
+    protected $log;
+
+    /**
+     * The meta name for this field's value.
+     *
+     * @var string $meta_name The meta name for this field's value.
+     */
+    public $meta_name;
+
+    /**
+     * The custom field settings.
+     *
+     * @var null|array $raw_custom_field The custom field settings.
+     */
+    public $raw_custom_field;
+
+    /**
+     * The schema.org predicate.
+     *
+     * @var string $predicate The schema.org predicate.
+     */
+    public $predicate;
+
+    /**
+     * The field's label.
+     *
+     * @var string $label The field's label.
+     */
+    public $label;
+
+    /**
+     * The WordLift data type.
+     *
+     * @var string $expected_wl_type The WordLift data type.
+     */
+    public $expected_wl_type;
+
+    /**
+     * The RDF data type.
+     *
+     * @var string $expected_uri_type The RDF data type.
+     */
+    public $expected_uri_type;
+
+    /**
+     * The cardinality.
+     *
+     * @var int $cardinality The cardinality.
+     */
+    public $cardinality;
+
+    /**
+     * The current value.
+     *
+     * @var array $data The current value.
+     */
+    public $data;
+
+    /**
+     * Create a {@link WL_Metabox_Field} instance.
+     *
+     * @param array $args An array of parameters.
+     */
+    public function __construct( $args ) {
+
+        $this->log = Wordlift_Log_Service::get_logger( 'WL_Metabox_Field' );
+
+        if ( empty( $args ) ) {
+            return;
+        }
+
+        // Save a copy of the custom field's params.
+        $this->raw_custom_field = reset( $args );
+
+        // Extract meta name (post_meta key for the DB).
+        $this->meta_name = key( $args );
+
+        // Extract linked data predicate.
+        if ( isset( $this->raw_custom_field['predicate'] ) ) {
+            $this->predicate = $this->raw_custom_field['predicate'];
+        } else {
+            return;
+        }
+
+        // Extract human readable label.
+        $exploded_predicate = explode( '/', $this->predicate );
+
+        // Use the label defined for the property if set, otherwise the last part of the schema.org/xyz predicate.
+        $this->label = isset( $this->raw_custom_field['metabox']['label'] ) ? $this->raw_custom_field['metabox']['label'] : end( $exploded_predicate );
+
+        // Extract field constraints (numerosity, expected type).
+        // Default constaints: accept one string..
+        if ( isset( $this->raw_custom_field['type'] ) ) {
+            $this->expected_wl_type = $this->raw_custom_field['type'];
+        } else {
+            $this->expected_wl_type = Wordlift_Schema_Service::DATA_TYPE_STRING;
+        }
+
+        $this->cardinality = 1;
+        if ( isset( $this->raw_custom_field['constraints'] ) ) {
+
+            $constraints = $this->raw_custom_field['constraints'];
+
+            // Extract cardinality.
+            if ( isset( $constraints['cardinality'] ) ) {
+                $this->cardinality = $constraints['cardinality'];
+            }
+
+            // Which type of entity can we accept (e.g. Place, Event, ecc.)? .
+            if ( Wordlift_Schema_Service::DATA_TYPE_URI === $this->expected_wl_type && isset( $constraints['uri_type'] ) ) {
+                $this->expected_uri_type = is_array( $constraints['uri_type'] )
+                    ? $constraints['uri_type']
+                    : array( $constraints['uri_type'] );
+            }
+        }
+
+    }
+
+    /**
+     * Return nonce HTML.
+     *
+     * Overwrite this method in a child class to obtain custom behaviour.
+     */
+    public function html_nonce() {
+
+        return wp_nonce_field( 'wordlift_' . $this->meta_name . '_entity_box', 'wordlift_' . $this->meta_name . '_entity_box_nonce', true, false );
+    }
+
+    /**
+     * Verify nonce.
+     *
+     * Overwrite this method in a child class to obtain custom behaviour.
+     *
+     * @return boolean Nonce verification.
+     */
+    public function verify_nonce() {
+
+        $nonce_name   = 'wordlift_' . $this->meta_name . '_entity_box_nonce';
+        $nonce_verify = 'wordlift_' . $this->meta_name . '_entity_box';
+
+        if ( ! isset( $_POST[ $nonce_name ] ) ) {
+            return false;
+        }
+
+        // Verify that the nonce is valid.
+        return wp_verify_nonce( $_POST[ $nonce_name ], $nonce_verify );
+    }
+
+    /**
+     * Load data from DB and store the resulting array in $this->data.
+     *
+     * Overwrite this method in a child class to obtain custom behaviour.
+     */
+    public function get_data() {
+
+        $data = get_post_meta( get_the_ID(), $this->meta_name );
+
+        // Values are always contained in an array (makes it easier to manage cardinality).
+        if ( ! is_array( $data ) ) {
+            $data = array( $data );
+        }
+
+        $this->data = $data;
+    }
+
+    /**
+     * Sanitizes data before saving to DB. Default sanitization trashes empty
+     * values.
+     *
+     * Stores the sanitized values into $this->data so they can be later processed.
+     * Overwrite this method in a child class to obtain custom behaviour.
+     *
+     * @param array $values Array of values to be sanitized and then stored into
+     *                      $this->data.
+     */
+    public function sanitize_data( $values ) {
+
+        $sanitized_data = array();
+
+        if ( ! is_array( $values ) ) {
+            $values = array( $values );
+        }
+
+        foreach ( $values as $value ) {
+            $sanitized_value = $this->sanitize_data_filter( $value );
+            if ( ! is_null( $sanitized_value ) ) {
+                $sanitized_data[] = $sanitized_value;
+            }
+        }
+
+        $this->data = $sanitized_data;
+    }
+
+    /**
+     * Sanitize a single value. Called from $this->sanitize_data. Default
+     * sanitization excludes empty values.
+     *
+     * Overwrite this method in a child class to obtain custom behaviour.
+     *
+     * @param string $value The value to sanitize.
+     *
+     * @return mixed Returns sanitized value, or null.
+     */
+    public function sanitize_data_filter( $value ) {
+
+        // TODO: all fields should provide their own sanitize which shouldn't
+        // be part of a UI class.
+
+        // If the field provides its own validation, use it.
+        if ( isset( $this->raw_custom_field['sanitize'] ) ) {
+            return call_user_func( $this->raw_custom_field['sanitize'], $value );
+        }
+
+        if ( ! is_null( $value ) && '' !== $value ) {         // do not use 'empty()' -> https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/ .
+            return $value;
+        }
+
+        return null;
+    }
+
+    /**
+     * Save data to DB.
+     *
+     * Overwrite this method in a child class to obtain custom behaviour.
+     *
+     * @param array $values Array of values to be sanitized and then stored into $this->data.
+     */
+    public function save_data( $values ) {
+
+        // Will sanitize data and store them in $field->data.
+        $this->sanitize_data( $values );
+
+        $entity_id = get_the_ID();
+
+        // Take away old values.
+        delete_post_meta( $entity_id, $this->meta_name );
+
+        // insert new values, respecting cardinality.
+        $single = ( 1 === $this->cardinality );
+        foreach ( $this->data as $value ) {
+            add_post_meta( $entity_id, $this->meta_name, $value, $single );
+        }
+    }
+
+    /**
+     * Returns the HTML tag that will contain the Field. By default the we
+     * return a <div> with data- attributes on cardinality and expected types.
+     *
+     * It is useful to provide data- attributes for the JS scripts.
+     *
+     * Overwrite this method in a child class to obtain custom behaviour.
+     */
+    public function html_wrapper_open() {
+
+        return "<div class='wl-field' data-cardinality='$this->cardinality'>";
+    }
+
+    /**
+     * Returns Field HTML (nonce included).
+     *
+     * Overwrite this method (or methods called from this method) in a child
+     * class to obtain custom behaviour.
+     */
+    public function html() {
+
+        // Open main <div> for the Field.
+        $html = $this->html_wrapper_open();
+
+        // Label.
+        $html .= "<h3>$this->label</h3>";
+
+        // print nonce.
+        $html .= $this->html_nonce();
+
+        // print data loaded from DB.
+        $count = 0;
+        if ( $this->data ) {
+            foreach ( $this->data as $value ) {
+                if ( $count < $this->cardinality ) {
+                    $html .= $this->html_input( $value );
+                }
+                $count ++;
+            }
+        }
+
+        // Print the empty <input> to add new values.
+        if ( 0 === $count ) { // } || $count < $this->cardinality ) { DO NOT print empty inputs unless requested by the editor since fields might support empty strings.
+            $html .= $this->html_input( '' );    // Will print an empty <input>.
+            $count ++;
+        }
+
+        // If cardiality allows it, print button to add new values.
+        if ( $count < $this->cardinality ) {
+            $html .= '<button class="button wl-add-input wl-button" type="button">Add</button>';
+        }
+
+        // Close the HTML wrapper.
+        $html .= $this->html_wrapper_close();
+
+        return $html;
+    }
+
+    /**
+     * Return a single <input> tag for the Field.
+     *
+     * @param mixed $value Input value.
+     *
+     * @return string The html code fragment.
+     */
+    public function html_input( $value ) {
+        $html = <<<EOF
 			<div class="wl-input-wrapper">
 				<input type="text" id="$this->meta_name" name="wl_metaboxes[$this->meta_name][]" value="$value" style="width:88%" />
 				<button class="button wl-remove-input wl-button" type="button">Remove</button>
 			</div>
 EOF;
 
-		return $html;
-	}
+        return $html;
+    }
 
-	/**
-	 * Returns closing for the wrapper HTML tag.
-	 */
-	public function html_wrapper_close() {
+    /**
+     * Returns closing for the wrapper HTML tag.
+     */
+    public function html_wrapper_close() {
 
-		return '</div><hr>';
-	}
+        return '</div><hr>';
+    }
 
 }

Spacing +48 added lines, -48 removed lines

@@ -89,56 +89,56 @@ 
 	 *
 	 * @param array $args An array of parameters.
 	 */
-	public function __construct( $args ) {
+	public function __construct($args) {
 
-		$this->log = Wordlift_Log_Service::get_logger( 'WL_Metabox_Field' );
+		$this->log = Wordlift_Log_Service::get_logger('WL_Metabox_Field');
 
-		if ( empty( $args ) ) {
+		if (empty($args)) {
 			return;
 		}
 
 		// Save a copy of the custom field's params.
-		$this->raw_custom_field = reset( $args );
+		$this->raw_custom_field = reset($args);
 
 		// Extract meta name (post_meta key for the DB).
-		$this->meta_name = key( $args );
+		$this->meta_name = key($args);
 
 		// Extract linked data predicate.
-		if ( isset( $this->raw_custom_field['predicate'] ) ) {
+		if (isset($this->raw_custom_field['predicate'])) {
 			$this->predicate = $this->raw_custom_field['predicate'];
 		} else {
 			return;
 		}
 
 		// Extract human readable label.
-		$exploded_predicate = explode( '/', $this->predicate );
+		$exploded_predicate = explode('/', $this->predicate);
 
 		// Use the label defined for the property if set, otherwise the last part of the schema.org/xyz predicate.
-		$this->label = isset( $this->raw_custom_field['metabox']['label'] ) ? $this->raw_custom_field['metabox']['label'] : end( $exploded_predicate );
+		$this->label = isset($this->raw_custom_field['metabox']['label']) ? $this->raw_custom_field['metabox']['label'] : end($exploded_predicate);
 
 		// Extract field constraints (numerosity, expected type).
 		// Default constaints: accept one string..
-		if ( isset( $this->raw_custom_field['type'] ) ) {
+		if (isset($this->raw_custom_field['type'])) {
 			$this->expected_wl_type = $this->raw_custom_field['type'];
 		} else {
 			$this->expected_wl_type = Wordlift_Schema_Service::DATA_TYPE_STRING;
 		}
 
 		$this->cardinality = 1;
-		if ( isset( $this->raw_custom_field['constraints'] ) ) {
+		if (isset($this->raw_custom_field['constraints'])) {
 
 			$constraints = $this->raw_custom_field['constraints'];
 
 			// Extract cardinality.
-			if ( isset( $constraints['cardinality'] ) ) {
+			if (isset($constraints['cardinality'])) {
 				$this->cardinality = $constraints['cardinality'];
 			}
 
 			// Which type of entity can we accept (e.g. Place, Event, ecc.)? .
-			if ( Wordlift_Schema_Service::DATA_TYPE_URI === $this->expected_wl_type && isset( $constraints['uri_type'] ) ) {
-				$this->expected_uri_type = is_array( $constraints['uri_type'] )
+			if (Wordlift_Schema_Service::DATA_TYPE_URI === $this->expected_wl_type && isset($constraints['uri_type'])) {
+				$this->expected_uri_type = is_array($constraints['uri_type'])
 					? $constraints['uri_type']
-					: array( $constraints['uri_type'] );
+					: array($constraints['uri_type']);
 			}
 		}
 
@@ -151,7 +151,7 @@ 
 	 */
 	public function html_nonce() {
 
-		return wp_nonce_field( 'wordlift_' . $this->meta_name . '_entity_box', 'wordlift_' . $this->meta_name . '_entity_box_nonce', true, false );
+		return wp_nonce_field('wordlift_'.$this->meta_name.'_entity_box', 'wordlift_'.$this->meta_name.'_entity_box_nonce', true, false);
 	}
 
 	/**
@@ -163,15 +163,15 @@ 
 	 */
 	public function verify_nonce() {
 
-		$nonce_name   = 'wordlift_' . $this->meta_name . '_entity_box_nonce';
-		$nonce_verify = 'wordlift_' . $this->meta_name . '_entity_box';
+		$nonce_name   = 'wordlift_'.$this->meta_name.'_entity_box_nonce';
+		$nonce_verify = 'wordlift_'.$this->meta_name.'_entity_box';
 
-		if ( ! isset( $_POST[ $nonce_name ] ) ) {
+		if ( ! isset($_POST[$nonce_name])) {
 			return false;
 		}
 
 		// Verify that the nonce is valid.
-		return wp_verify_nonce( $_POST[ $nonce_name ], $nonce_verify );
+		return wp_verify_nonce($_POST[$nonce_name], $nonce_verify);
 	}
 
 	/**
@@ -181,11 +181,11 @@ 
 	 */
 	public function get_data() {
 
-		$data = get_post_meta( get_the_ID(), $this->meta_name );
+		$data = get_post_meta(get_the_ID(), $this->meta_name);
 
 		// Values are always contained in an array (makes it easier to manage cardinality).
-		if ( ! is_array( $data ) ) {
-			$data = array( $data );
+		if ( ! is_array($data)) {
+			$data = array($data);
 		}
 
 		$this->data = $data;
@@ -201,17 +201,17 @@ 
 	 * @param array $values Array of values to be sanitized and then stored into
 	 *                      $this->data.
 	 */
-	public function sanitize_data( $values ) {
+	public function sanitize_data($values) {
 
 		$sanitized_data = array();
 
-		if ( ! is_array( $values ) ) {
-			$values = array( $values );
+		if ( ! is_array($values)) {
+			$values = array($values);
 		}
 
-		foreach ( $values as $value ) {
-			$sanitized_value = $this->sanitize_data_filter( $value );
-			if ( ! is_null( $sanitized_value ) ) {
+		foreach ($values as $value) {
+			$sanitized_value = $this->sanitize_data_filter($value);
+			if ( ! is_null($sanitized_value)) {
 				$sanitized_data[] = $sanitized_value;
 			}
 		}
@@ -229,17 +229,17 @@ 
 	 *
 	 * @return mixed Returns sanitized value, or null.
 	 */
-	public function sanitize_data_filter( $value ) {
+	public function sanitize_data_filter($value) {
 
 		// TODO: all fields should provide their own sanitize which shouldn't
 		// be part of a UI class.
 
 		// If the field provides its own validation, use it.
-		if ( isset( $this->raw_custom_field['sanitize'] ) ) {
-			return call_user_func( $this->raw_custom_field['sanitize'], $value );
+		if (isset($this->raw_custom_field['sanitize'])) {
+			return call_user_func($this->raw_custom_field['sanitize'], $value);
 		}
 
-		if ( ! is_null( $value ) && '' !== $value ) {         // do not use 'empty()' -> https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/ .
+		if ( ! is_null($value) && '' !== $value) {         // do not use 'empty()' -> https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/ .
 			return $value;
 		}
 
@@ -253,20 +253,20 @@ 
 	 *
 	 * @param array $values Array of values to be sanitized and then stored into $this->data.
 	 */
-	public function save_data( $values ) {
+	public function save_data($values) {
 
 		// Will sanitize data and store them in $field->data.
-		$this->sanitize_data( $values );
+		$this->sanitize_data($values);
 
 		$entity_id = get_the_ID();
 
 		// Take away old values.
-		delete_post_meta( $entity_id, $this->meta_name );
+		delete_post_meta($entity_id, $this->meta_name);
 
 		// insert new values, respecting cardinality.
-		$single = ( 1 === $this->cardinality );
-		foreach ( $this->data as $value ) {
-			add_post_meta( $entity_id, $this->meta_name, $value, $single );
+		$single = (1 === $this->cardinality);
+		foreach ($this->data as $value) {
+			add_post_meta($entity_id, $this->meta_name, $value, $single);
 		}
 	}
 
@@ -302,23 +302,23 @@ 
 
 		// print data loaded from DB.
 		$count = 0;
-		if ( $this->data ) {
-			foreach ( $this->data as $value ) {
-				if ( $count < $this->cardinality ) {
-					$html .= $this->html_input( $value );
+		if ($this->data) {
+			foreach ($this->data as $value) {
+				if ($count < $this->cardinality) {
+					$html .= $this->html_input($value);
 				}
-				$count ++;
+				$count++;
 			}
 		}
 
 		// Print the empty <input> to add new values.
-		if ( 0 === $count ) { // } || $count < $this->cardinality ) { DO NOT print empty inputs unless requested by the editor since fields might support empty strings.
-			$html .= $this->html_input( '' );    // Will print an empty <input>.
-			$count ++;
+		if (0 === $count) { // } || $count < $this->cardinality ) { DO NOT print empty inputs unless requested by the editor since fields might support empty strings.
+			$html .= $this->html_input(''); // Will print an empty <input>.
+			$count++;
 		}
 
 		// If cardiality allows it, print button to add new values.
-		if ( $count < $this->cardinality ) {
+		if ($count < $this->cardinality) {
 			$html .= '<button class="button wl-add-input wl-button" type="button">Add</button>';
 		}
 
@@ -335,7 +335,7 @@ 
 	 *
 	 * @return string The html code fragment.
 	 */
-	public function html_input( $value ) {
+	public function html_input($value) {
 		$html = <<<EOF
 			<div class="wl-input-wrapper">
 				<input type="text" id="$this->meta_name" name="wl_metaboxes[$this->meta_name][]" value="$value" style="width:88%" />