install.php

<?php

/**
 * Class WP_SMS_INSTALL
 */
class WP_SMS_INSTALL {

    /**
     * Table SQL
     *
     * @param  Not param
     */
    public function table_sql()
    {
        global $wpdb;
        require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );

        $table_name = $wpdb->prefix.'sms_subscribes';
        if( $wpdb->get_var( "show tables like '{$table_name}'" ) != $table_name ) {
            $create_sms_subscribes = ("CREATE TABLE IF NOT EXISTS {$table_name}(
            ID int(10) NOT NULL auto_increment,
            date DATETIME,
            name VARCHAR(20),
            mobile VARCHAR(20) NOT NULL,
            status tinyint(1),
            activate_key INT(11),
            group_ID int(5),
            PRIMARY KEY(ID)) CHARSET=utf8");

            dbDelta( $create_sms_subscribes );
        }

        $table_name = $wpdb->prefix.'sms_subscribes_group';
        if( $wpdb->get_var( "show tables like '{$table_name}'" ) != $table_name ) {
            $create_sms_subscribes_group = ("CREATE TABLE IF NOT EXISTS {$table_name}(
            ID int(10) NOT NULL auto_increment,
            name VARCHAR(250),
            PRIMARY KEY(ID)) CHARSET=utf8");

            dbDelta( $create_sms_subscribes_group );
        }

        $table_name = $wpdb->prefix.'sms_send';
        if( $wpdb->get_var( "show tables like '{$table_name}'" ) != $table_name ) {
            $create_sms_send = ("CREATE TABLE IF NOT EXISTS {$table_name}(
            ID int(10) NOT NULL auto_increment,
            date DATETIME,
            sender VARCHAR(20) NOT NULL,
            message TEXT NOT NULL,
            recipient TEXT NOT NULL,
            PRIMARY KEY(ID)) CHARSET=utf8");

            dbDelta( $create_sms_send );
        }
    }


    /**
     * Adding new MYSQL Table in Activation Plugin
     *
     * @param  Not param
     */
    public function create_table( $network_wide )
    {
        global $wpdb;

        if ( is_multisite() && $network_wide ) {
            $blog_ids = $wpdb->get_col( "SELECT blog_id FROM $wpdb->blogs" );
            foreach ( $blog_ids as $blog_id ) {
                switch_to_blog( $blog_id );
                $this->table_sql();
                restore_current_blog();
            }
        } else {
            $this->table_sql();
        }

    }

}