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Editing: base-multiple.php

<?php
namespace Elementor;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

/**
 * Elementor control base multiple.
 *
 * An abstract class for creating new controls in the panel that return
 * more than a single value. Each value of the multi-value control will
 * be returned as an item in a `key => value` array.
 *
 * @since 1.0.0
 * @abstract
 */
abstract class Control_Base_Multiple extends Base_Data_Control {

/**
	 * Get multiple control default value.
	 *
	 * Retrieve the default value of the multiple control. Used to return the default
	 * values while initializing the multiple control.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @return array Control default value.
	 */
	public function get_default_value() {
		return [];
	}

/**
	 * Get multiple control value.
	 *
	 * Retrieve the value of the multiple control from a specific Controls_Stack settings.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $control  Control.
	 * @param array $settings Settings.
	 *
	 * @return mixed Control values.
	 */
	public function get_value( $control, $settings ) {
		$value = parent::get_value( $control, $settings );

if ( empty( $control['default'] ) ) {
			$control['default'] = [];
		}

if ( ! is_array( $value ) ) {
			$value = [];
		}

$control['default'] = array_merge(
			$this->get_default_value(),
			$control['default']
		);

return array_merge(
			$control['default'],
			$value
		);
	}

/**
	 * Get multiple control style value.
	 *
	 * Retrieve the style of the control. Used when adding CSS rules to the control
	 * while extracting CSS from the `selectors` data argument.
	 *
	 * @since 1.0.5
	 * @since 2.3.3 New `$control_data` parameter added.
	 * @access public
	 *
	 * @param string $css_property  CSS property.
	 * @param array  $control_value Control value.
	 * @param array  $control_data Control Data.
	 *
	 * @return array Control style value.
	 */
	public function get_style_value( $css_property, $control_value, array $control_data ) {
		return $control_value[ strtolower( $css_property ) ];
	}
}