Modify medtaboxes

modify-metaboxes.php

<?php
/**
 * Registering meta boxes, based on these metaboxes:
 * @link http://www.deluxeblogtips.com/meta-box/docs/define-meta-boxes
 */
// Add new metaboxes
add_action( 'admin_init', 'jdn_modify_metabox_fields', 1 );
/**
 * Modify exist metaboxes to include a new field
 * @author Joshua David Nelson, josh@joshuadnelson.com
 * @since 1.0.0
 **/
function jdn_modify_metabox_fields() {	

	$prefix = 'nt_';
	global $meta_boxes;

	if( !is_null( jdn_find_in_array( $meta_boxes, 'propertyprice', 'id' ) ) ) {
		$key = jdn_find_in_array( $meta_boxes, 'propertyprice', 'id' );
		$fields = $meta_boxes[ $key ][ 'fields' ];
		$new_field = array(
			array(
				'name'	=> 'Custom Price',
				'desc'	=> 'This will override the pricing options above.',
				'id'	=> $prefix . 'custom_price',
				'type'	=> 'text',
				'clone'	=> false,
				'std'	=> '',
			)
		);
		$meta_boxes[ $key ][ 'fields' ] = array_merge( $fields, $new_field );
		
		// Replace a Field values
		$sub_key = jdn_find_in_array( $meta_boxes[ $key ][ 'fields' ], 'nt_status', 'id' );
		$meta_boxes[ $key ][ 'fields' ][ $sub_key ][ 'options' ] = array(
			'for-sale'	=> 'for Sale',
			'for-lease'	=> 'for Lease', // keeping slug to avoid errors elsewhere
			'for-sublease'	=> 'for Sublease',
			'sold'		=> 'Sold',
			'upcoming'  	=> 'Upcoming',
			'inquire'   	=> 'Inquire'
		);
	}
}

/**
 * Function to search for a metabox field and return the key
 * @author Joshua David Nelson, josh@joshuadnelson.com
 * @link http://stackoverflow.com/questions/8102221/php-multidimensional-array-searching-find-key-by-specific-value
 **/
function jdn_find_in_array( $array, $needle, $term ) {
	foreach( $array as $key => $value ) {
		if ( $value[ $term ] === $needle )
			return $key;
	}
	return null;
}