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<?php
/*
Plugin Name: Visit Counter
Description: Counts and displays the number of visits to your site.
Version: 1.0
Author: Your Name
*/

// 创建一个新的数据库表来存储访问次数
function create_visit_counter_table() {
    global $wpdb;
    $table_name = $wpdb->prefix . 'visit_counter';
    $charset_collate = $wpdb->get_charset_collate();
    $sql = "CREATE TABLE $table_name (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        visit_count bigint(20) DEFAULT '0' NOT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";
    require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
    dbDelta( $sql );
}
register_activation_hook( __FILE__, 'create_visit_counter_table' );

// 增加访问次数
function increment_visit_counter() {
    global $wpdb;
    $table_name = $wpdb->prefix . 'visit_counter';
    $result = $wpdb->get_results( "SELECT * FROM $table_name" );
    if ( $result ) {
        $visit_count = $result[0]->visit_count + 1;
        $wpdb->update( $table_name, array( 'visit_count' => $visit_count ), array( 'id' => 1 ) );
    } else {
        $wpdb->insert( $table_name, array( 'visit_count' => 1 ) );
    }
}
add_action( 'wp_head', 'increment_visit_counter' );

// 显示访问次数
function display_visit_counter() {
    global $wpdb;
    $table_name = $wpdb->prefix . 'visit_counter';
    $result = $wpdb->get_results( "SELECT * FROM $table_name" );
    if ( $result ) {
        echo 'Total Visits: ' . $result[0]->visit_count;
    } else {
        echo 'Total Visits: 0';
    }
}