gistfile1.txt

add_filter( 'propertyhive_user_details_form_fields', 'split_out_tel_in_reg_form' );
function split_out_tel_in_reg_form($fields)
{
    // Step 1: Split the array at the position where the new element needs to be inserted
    $position = array_search('telephone_number', array_keys($fields));
    $before = array_slice($fields, 0, $position, true);
    $after = array_slice($fields, $position, null, true);

    // Step 2: Define the new element
    $new_element = array(
        'telephone_number_code' => array(
			'type' => 'text',
			'label' => __( 'Telephone Number Code', 'propertyhive' ),
			'show_label' => true,
			'before' => '<div class="control control-telephone-number-code">',
			'required' => false
	));

    // Step 3: Merge the arrays together with the new element in the correct position
    $fields = array_merge($before, $new_element, $after);
	
	if ( isset($_POST['telephone_number_code']) && isset($_POST['telephone_number']) )
	{
		$_POST['telephone_number'] = $_POST['telephone_number_code'] . ' ' . $_POST['telephone_number'];
	}
	
    return $fields;
}