To create a plugin in wordpress we need to create a folder and php file in it with same name and place it under WP-content/plugins directory
Then in the file add the following comments that describe the plugin
<?php
/*
Plugin Name: Name Of The Plugin
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Version: The Plugin's Version Number, e.g.: 1.0
Author: Name Of The Plugin Author
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2
*/
?>
The minimum information WordPress needs to recognize your Plugin is the Plugin Name line.
To add admin menu side use following hook:
add_action('admin_menu', 'gvp_add_menu_page');
function gvp_add_menu_page() {
add_menu_page("ORDERS TILL NOW", "View Orders", "activate_plugins", "view_orders", "orders_admin_page");
}
function orders_admin_page()
{
include_once dirname(__FILE__) . '/adminend.php';
}
To perform actions at initialization use :
register_activation_hook(__FILE__, 'initialize_me');
function initialize_me() {
global $wpdb;
$jsrm_menu_table = $wpdb->prefix . "jsrm_menus";
$jsrm_item_table = $wpdb->prefix . "jsrm_items";
$gav_order_table = $wpdb->prefix . "gav_orders";
$gav_order_items_table = $wpdb->prefix . "gav_orders_items";
$gav_users_table= $wpdb->prefix . "gav_users";
require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
if (!empty($wpdb->charset))
$charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
if (!empty($wpdb->collate))
$charset_collate .= " COLLATE $wpdb->collate";
if ($wpdb->get_var("SHOW TABLES LIKE $gav_users_table") != $gav_users_table) {
$sql1 = "CREATE TABLE IF NOT EXISTS $gav_users_table (
id mediumint(9) NOT NULL AUTO_INCREMENT,
fname text NOT NULL,
lname text NOT NULL,
address text NOT NULL,
email text NOT NULL,
phone varchar(255) NOT NULL,
ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
UNIQUE KEY id (id)
) $charset_collate;";
dbDelta($sql1);
}
if ($wpdb->get_var("SHOW TABLES LIKE $gav_order_table") != $gav_order_table) {
$sql3 = "CREATE TABLE IF NOT EXISTS $gav_order_table (
id mediumint(9) NOT NULL AUTO_INCREMENT,
custid mediumint(9) NOT NULL,
status tinyint(1) NOT NULL,
UNIQUE KEY id (id),
CONSTRAINT `OrderOfCustomer` FOREIGN KEY (`custid`) REFERENCES `$gav_users_table` (`id`)
) $charset_collate;";
dbDelta($sql3);
}
if ($wpdb->get_var("SHOW TABLES LIKE $gav_order_items_table") != $gav_order_items_table) {
$sql2 = "CREATE TABLE IF NOT EXISTS $gav_order_items_table (
id mediumint(9) NOT NULL AUTO_INCREMENT,
orderid mediumint(9) NOT NULL,
itemid mediumint(9) NOT NULL,
qty mediumint(9) NOT NULL,
amt int(15) NOT NULL,
UNIQUE KEY id (id),
CONSTRAINT `ItemsofOrder` FOREIGN KEY (`orderid`) REFERENCES `$gav_order_table` (`id`)
) $charset_collate;";
dbDelta($sql2);
}
add_option("gav_order_version", $xap_db_version);
}
To add Shortcode:
add_shortcode('gav-show-menu', 'gav_showmenu');
function gav_showmenu($atts) {
}
To add stylesheet:
function gav_stylesheet() {
$gavStyleUrl = WP_PLUGIN_URL . '/gav-retail-order/css/main-stylesheet.css';
$gavStyleFile = WP_PLUGIN_DIR . '/gav-retail-order/css/main-stylesheet.css';
//echo file_exists($gavStyleUrl);
if (file_exists($gavStyleFile)) {
wp_register_style('gavStyleSheet', $gavStyleUrl);
wp_enqueue_style('gavStyleSheet');
}
}
add_action('wp_print_styles', 'gav_stylesheet');
