[MarketPress] - Enabled Search By SKU From Admin Panel Product

mp-enabled-search-by-sku-from-admin-panel-product.php

<?php
/**
 * Plugin Name: [MarketPress] - Enabled Search By SKU From Admin Panel Product
 * Plugin URI: https://premium.wpmudev.org/
 * Author: WPMUDEV
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}


add_action( 'plugins_loaded', 'wpmudev_mp_enabled_search_by_sku_admin_func', 100 );
function wpmudev_mp_enabled_search_by_sku_admin_func() {
	if ( defined( 'MP_VERSION' ) && class_exists( 'Marketpress' ) ) {
		// only for admin screen
		if( ! is_admin() ) return;

		global $pagenow;
		if ( $pagenow !== 'edit.php' || ! isset( $_GET[ 'post_type' ] ) || 'product' !== $_GET[ 'post_type' ] || empty( $_GET['s']) ) return;

		function wpmudev_mp_enabled_search_by_sku_admin_panel_product( $per_page ) {
			global $wp_query;

			if( ! $wp_query->is_search || $wp_query->found_posts ){
				return $per_page;
			}

	    	unset( $wp_query->query['s'] );
	    	$old_meta_query = isset( $wp_query->query['meta_query'] ) ? $wp_query->query['meta_query'] : false;
	    	$wp_query->query['meta_query'] = array(
	    		array(
	    			'key' => 'sku',
	    			'value' => $_REQUEST['s'],
	    			'compare' => 'LIKE' // '=' for absolute, 'LIKE' for relactive
	    		)
	    	);
	        $wp_query = new WP_Query( $wp_query->query );

	        // fix error in touch_time
	        if( ! isset( $GLOBALS['post'] ) && ! empty( $wp_query->post ) ){
	        	$GLOBALS['post'] = $wp_query->post;
	        }

	        // Set query back
	        if( $old_meta_query ){
	        	$wp_query->query['meta_query'] = $old_meta_query;
	        }
	        $wp_query->set('s', $_REQUEST['s']);

			return $per_page;
		}
		add_action( 'edit_product_per_page', 'wpmudev_mp_enabled_search_by_sku_admin_panel_product' );

	}

}