Using the form input class.

using-input-class-demo.php

<?php

/**
 * Displays metabox content
 *
 * Displays metabox content based on the metabox array, usually set in the
 * theme's functions.php file.
 *
 * @since 1.0
 * @param array $post The current post object.
 * @param array $metabox_fields The fields that will populate the metabox.
 */
function thtk_display_metabox_content( $post, $metabox_fields ) {
  echo '<div class="thtk-metabox"><table class="form-table">';
	
	// Sets security nonce
	wp_nonce_field( 'thtk_metabox_nonce', 'metabox_nonce' );
	
	// Gets stored values from the database.
	$values = get_post_custom( $post->ID );
	
	// Loops through each array element and calls the corresponding display function.
	foreach( $metabox_fields[ 'args' ] as $metabox_field ) {

		// Sets previously stored value and checks for new description.
		$metabox_field[ 'value' ] = isset( $values[ $metabox_field[ 'id' ] ] ) ? esc_attr( $values[ $metabox_field[ 'id' ] ][ 0 ] ) : '';
	
		// Uses the THTK_Form_Metabox class to dispay the metabox setting.
		$thtk_input = new THTK_Form_Metabox( $metabox_field );
		echo $thtk_input->get_metabox();

	} // End foreach $metabox_fields[ 'args' ]

	// HTML to match WordPress native formatting.
	echo '</table></div><!-- .thtk-metabox -->';
	
} // End thtk_display_metabox_content()