set-fav-icon.php

<?php

/*
Plugin Name: Easy Set Favicon
Plugin URI: https://github.com/eftakhairul/Set-Fav-Icon/blob/master/README.md
Description: Set the fav-icon in your blog or website just by putting a link.
Version: 1.0
Author: Eftakhairul Islam & Sirajus Salayhin 
Author URI: https://github.com/eftakhairul/Set-Fav-Icon/blob/master/README.md
License: GPL2
*/

include_once('installation-plugin.php');

register_activation_hook (__FILE__,'es_favicon_install');
register_deactivation_hook (__FILE__,'es_favicon_uninstall');

add_action('admin_menu', 'es_set_favicon_create_menu');
add_action('wp_head', 'es_enqueue_favicon_head');
add_action('admin_head', 'es_enqueue_favicon_head');


function es_set_favicon_create_menu()
{
    $main_option_page = __FILE__;
    add_menu_page('Set Fav Icon', 'Set Fav Icon Url', 'administrator', 'ad-fav-icon', 'es_save_favicon_url',plugins_url('/set-fav-icon/images/icon_pref_settings.gif','set-fav-icon'));
}

function es_enqueue_favicon_head()
{
    global $wpdb;
    $favIconTable = $wpdb->prefix . "fav_icon_link";
    $result = $wpdb->get_results("SELECT * FROM $favIconTable WHERE id = 1");

    if (!empty($result)) {
        echo '<link rel="shortcut icon" href="' . $result[0]->link . '" type="image/x-icon" /><!-- Favicon -->';
    }
}

function es_save_favicon_url()
{
    include("save-icon-url.php");
}