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Edit File: class-themify-walker-nav-menu-edit.php

<?php
/**
 * Create HTML list of nav menu input items.
 *
 * @uses Walker_Nav_Menu
 */
class Themify_Walker_Nav_Menu_Edit extends Walker_Nav_Menu_Edit {
	/**
	 * Start the element output.
	 *
	 * We're injecting our custom fields after the div.submitbox
	 *
	 * @see Walker_Nav_Menu::start_el()
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $item   Menu item data object.
	 * @param int    $depth  Depth of menu item. Used for padding.
	 * @param array  $args   Menu item args.
	 * @param int    $id     Nav menu ID.
	 */
	function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
		$item_output = '';

parent::start_el( $item_output, $item, $depth, $args, $id );

$output .= preg_replace(
			// NOTE: Check this regex from time to time!
			'/(?=<(fieldset|p)[^>]+class="[^"]*field-move)/',
			$this->get_fields( $item, $depth, $args ),
			$item_output
		);
	}

/**
	 * Get custom fields
	 *
	 * @access protected
	 * @since 0.1.0
	 * @uses add_action() Calls 'menu_item_custom_fields' hook
	 *
	 * @param object $item   Menu item data object.
	 * @param int    $depth  Depth of menu item. Used for padding.
	 * @param array  $args   Menu item args.
	 * @param int    $id     Nav menu ID.
	 *
	 * @return string Form fields
	 */
	protected function get_fields( $item, $depth, $args = array(), $id = 0 ) {
		ob_start();

/**
		 * Get menu item custom fields from plugins/themes
		 *
		 * @since 0.1.0
		 * @since 1.0.0 Pass correct parameters.
		 *
		 * @param int    $item_id  Menu item ID.
		 * @param object $item     Menu item data object.
		 * @param int    $depth    Depth of menu item. Used for padding.
		 * @param array  $args     Menu item args.
		 * @param int    $id       Nav menu ID.
		 *
		 * @return string Custom fields HTML.
		 */
		do_action( 'wp_nav_menu_item_custom_fields', $item->ID, $item, $depth, $args, $id );

return ob_get_clean();
	}
}

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