Fahrzeug

class Custom_Meta_Box3 {

	public function __construct() {

		if ( is_admin() ) {
			add_action( 'load-post.php',     array( $this, 'init_metabox' ) );
			add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );
		}

	}

	public function init_metabox() {

		add_action( 'add_meta_boxes',        array( $this, 'add_metabox' )         );
		add_action( 'save_post',             array( $this, 'save_metabox' ), 10, 2 );

	}

	public function add_metabox() {

		add_meta_box(
			'wichtigste3',
			__( 'Fahrzeugspezifische Infos', 'fahrzeughandel' ),
			array( $this, 'render_metabox' ),
			'fahrzeug_handel',
			'advanced',
			'default'
		);

	}

	public function render_metabox( $post ) {

		// Retrieve an existing value from the database.
		$cs_typensch = get_post_meta( $post->ID, 'cs_typensch', true );
		$cs_fahrgestell = get_post_meta( $post->ID, 'cs_fahrgestell', true );
		$cs_neup = get_post_meta( $post->ID, 'cs_neup', true );

		// Set default values.
		if( empty( $cs_typensch ) ) $cs_typensch = '';
		if( empty( $cs_fahrgestell ) ) $cs_fahrgestell = '';
		if( empty( $cs_neup ) ) $cs_neup = '';

		// Form fields.
		echo '<table class="form-table">';

		echo '	<tr>';
		echo '		<th><label for="cs_typensch" class="cs_typensch_label">' . __( 'Typenscheinnr.', 'fahrzeughandel' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="text" id="cs_typensch" name="cs_typensch" class="cs_typensch_field" placeholder="' . esc_attr__( '', 'fahrzeughandel' ) . '" value="' . esc_attr( $cs_typensch ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '	<tr>';
		echo '		<th><label for="cs_fahrgestell" class="cs_fahrgestell_label">' . __( 'Fahrzgestellnr.', 'fahrzeughandel' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="text" id="cs_fahrgestell" name="cs_fahrgestell" class="cs_fahrgestell_field" placeholder="' . esc_attr__( '', 'fahrzeughandel' ) . '" value="' . esc_attr( $cs_fahrgestell ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '	<tr>';
		echo '		<th><label for="cs_neup" class="cs_neup_label">' . __( 'Neupreis', 'fahrzeughandel' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="number" id="cs_neup" name="cs_neup" class="cs_neup_field" placeholder="' . esc_attr__( '', 'fahrzeughandel' ) . '" value="' . esc_attr( $cs_neup ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '</table>';

	}

	public function save_metabox( $post_id, $post ) {

		// Sanitize user input.
		$cs_new_typensch = isset( $_POST[ 'cs_typensch' ] ) ? sanitize_text_field( $_POST[ 'cs_typensch' ] ) : '';
		$cs_new_fahrgestell = isset( $_POST[ 'cs_fahrgestell' ] ) ? sanitize_text_field( $_POST[ 'cs_fahrgestell' ] ) : '';
		$cs_new_neup = isset( $_POST[ 'cs_neup' ] ) ? floatval( $_POST[ 'cs_neup' ] ) : '';

		// Update the meta field in the database.
		update_post_meta( $post_id, 'cs_typensch', $cs_new_typensch );
		update_post_meta( $post_id, 'cs_fahrgestell', $cs_new_fahrgestell );
		update_post_meta( $post_id, 'cs_neup', $cs_new_neup );

	}

}

new Custom_Meta_Box3;