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Editing: contacts.php

<?php

class Stm_Contacts_Widget extends WP_Widget {

/**
	 * Register widget with WordPress.
	 */
	public function __construct() {
		parent::__construct(
			'contacts', // Base ID.
			esc_html__( 'Contacts', 'stm_motors_extends' ), // Name.
			array( 'description' => esc_html__( 'Contacts widget', 'stm_motors_extends' ) ) // Args.
		);
	}

/**
	 * Front-end display of widget.
	 *
	 * @see WP_Widget::widget()
	 *
	 * @param array $args     Widget arguments.
	 * @param array $instance Saved values from database.
	 */
	public function widget( $args, $instance ) {
		$title = apply_filters( 'widget_title', $instance['title'] );

echo wp_kses_post( $args['before_widget'] );
		if ( ! empty( $title ) ) {
			echo wp_kses_post( $args['before_title'] ) . esc_html( $title ) . wp_kses_post( $args['after_title'] );
		}
		echo '<ul class="stm-list-duty heading-font">';
		if ( ! empty( $instance['address'] ) ) {
			echo '<li class="widget_contacts_address"><div class="icon"><i class="stm-icon-pin"></i></div><div class="text">' . wp_kses_post( html_entity_decode( $instance['address'] ) ) . '</div></li>';
		}

if ( ! empty( $instance['phone'] ) ) {
			echo '<li class="widget_contacts_phone"><div class="icon"><i class="stm-service-icon-sales_phone"></i></div><div class="text">' . wp_kses_post( html_entity_decode( $instance['phone'] ) ) . '</div></li>';
		}

if ( ! empty( $instance['fax'] ) ) {
			echo '<li class="widget_contacts_hours"><div class="icon"><i class="stm-service-icon-sales_hours"></i></div><div class="text">' . wp_kses_post( html_entity_decode( $instance['fax'] ) ) . '</div></li>';
		}
		echo '</ul>';

echo wp_kses_post( $args['after_widget'] );
	}

/**
	 * Back-end widget form.
	 *
	 * @see WP_Widget::form()
	 *
	 * @param array $instance Previously saved values from database.
	 */
	public function form( $instance ) {

$title   = '';
		$address = '';
		$phone   = '';
		$fax     = '';
		$email   = '';

if ( isset( $instance['title'] ) ) {
			$title = $instance['title'];
		} else {
			$title = esc_html__( 'Contact', 'stm_motors_extends' );
		}

if ( isset( $instance['address'] ) ) {
			$address = $instance['address'];
		}

if ( isset( $instance['phone'] ) ) {
			$phone = $instance['phone'];
		}

if ( isset( $instance['fax'] ) ) {
			$fax = $instance['fax'];
		}

if ( isset( $instance['email'] ) ) {
			$email = $instance['email'];
		}

?>
		<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php esc_html_e( 'Title:', 'stm_motors_extends' ); ?></label>
			<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>">
		</p>
		<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'address' ) ); ?>"><?php esc_html_e( 'Address:', 'stm_motors_extends' ); ?></label>
			<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'address' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'address' ) ); ?>" type="text" value="<?php echo esc_attr( $address ); ?>">
		</p>
		<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'phone' ) ); ?>"><?php esc_html_e( 'Phone:', 'stm_motors_extends' ); ?></label>
			<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'phone' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'phone' ) ); ?>" type="text" value="<?php echo esc_attr( $phone ); ?>">
		</p>
		<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'fax' ) ); ?>"><?php esc_html_e( 'Sales Hours:', 'stm_motors_extends' ); ?></label>
			<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'fax' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'fax' ) ); ?>" type="text" value="<?php echo esc_attr( $fax ); ?>">
		</p>
		<?php
	}

/**
	 * Sanitize widget form values as they are saved.
	 *
	 * @see WP_Widget::update()
	 *
	 * @param array $new_instance Values just sent to be saved.
	 * @param array $old_instance Previously saved values from database.
	 *
	 * @return array Updated safe values to be saved.
	 */
	public function update( $new_instance, $old_instance ) {
		$instance            = array();
		$instance['title']   = ( ! empty( $new_instance['title'] ) ) ? esc_attr( $new_instance['title'] ) : '';
		$instance['address'] = ( ! empty( $new_instance['address'] ) ) ? esc_attr( $new_instance['address'] ) : '';
		$instance['phone']   = ( ! empty( $new_instance['phone'] ) ) ? esc_attr( $new_instance['phone'] ) : '';
		$instance['fax']     = ( ! empty( $new_instance['fax'] ) ) ? esc_attr( $new_instance['fax'] ) : '';
		$instance['email']   = ( ! empty( $new_instance['email'] ) ) ? sanitize_email( $new_instance['email'] ) : '';

return $instance;
	}

}

function register_contacts_widget() {
	register_widget( 'Stm_Contacts_Widget' );
}
add_action( 'widgets_init', 'register_contacts_widget' );

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