WordPress Custom Metabox Snippet

WordPress Custom Metabox Snippet

// Product meta box
/**
 * Adds a box to the main column on the Post and Page edit screens.
 */
function tormuz_add_meta_box() {

	$screens = array( 'product' );

	foreach ( $screens as $screen ) {

		add_meta_box(
			'tormuz_sectionid',
			__( 'Product Additional Info', 'st-framework' ),
			'tormuz_meta_box_callback',
			$screen,
			'side'
		);
	}
}
add_action( 'add_meta_boxes', 'tormuz_add_meta_box' );

/**
 * Prints the box content.
 * 
 * @param WP_Post $post The object for the current post/page.
 */
function tormuz_meta_box_callback( $post ) {

	// Add an nonce field so we can check for it later.
	wp_nonce_field( 'tormuz_meta_box', 'tormuz_meta_box_nonce' );

	/*
	 * Use get_post_meta() to retrieve an existing value
	 * from the database and use the value for the form.
	 */
	$product_amazon_link = get_post_meta( $post->ID, 'product_amazon_link', true );
	$product_new_price = get_post_meta( $post->ID, 'product_new_price', true );
	$product_old_price = get_post_meta( $post->ID, 'product_old_price', true );

	echo '<label for="product_amazon_link">';
	_e( 'Amazon Product Link:', 'st-framework' );
	echo '</label> ';
	echo "<br>";
	echo '<input class="widefat" type="text" id="product_amazon_link" name="product_amazon_link" value="' . esc_attr( $product_amazon_link ) . '" size="25" />';
	echo "<br>";
	echo "<br>";

	echo '<label for="product_amazon_link">';
	_e( 'New Price:', 'st-framework' );
	echo '</label> ';
	echo "<br>";
	echo '<input class="widefat" type="text" id="product_new_price" name="product_new_price" value="' . esc_attr( $product_new_price ) . '" size="25" />';
	echo "<br>";
	echo "<br>";

	echo '<label for="product_amazon_link">';
	_e( 'Old Price:', 'st-framework' );
	echo '</label> ';
	echo "<br>";
	echo '<input class="widefat" type="text" id="product_old_price" name="product_old_price" value="' . esc_attr( $product_old_price ) . '" size="25" />';
}

/**
 * When the post is saved, saves our custom data.
 *
 * @param int $post_id The ID of the post being saved.
 */
function tormuz_save_meta_box_data( $post_id ) {

	/*
	 * We need to verify this came from our screen and with proper authorization,
	 * because the save_post action can be triggered at other times.
	 */

	// Check if our nonce is set.
	if ( ! isset( $_POST['tormuz_meta_box_nonce'] ) ) {
		return;
	}

	// Verify that the nonce is valid.
	if ( ! wp_verify_nonce( $_POST['tormuz_meta_box_nonce'], 'tormuz_meta_box' ) ) {
		return;
	}

	// If this is an autosave, our form has not been submitted, so we don't want to do anything.
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return;
	}

	// Check the user's permissions.
	if ( ! current_user_can( 'edit_post', $post_id ) ) {
		return;
	}

	// Update the meta field in the database.
	update_post_meta( $post_id, 'product_amazon_link', sanitize_text_field( $_POST['product_amazon_link'] ) );
	update_post_meta( $post_id, 'product_new_price', sanitize_text_field( $_POST['product_new_price'] ) );
	update_post_meta( $post_id, 'product_old_price', sanitize_text_field( $_POST['product_old_price'] ) );
}
add_action( 'save_post', 'tormuz_save_meta_box_data' );