如果您想在插件激活时实际生成页面模板，可以使用以下方法：

<?php
/**
 * Plugin Name: Testtest
 * Description: Ignore
 * Version: 0.1
 * Author: windyjonas
 */
function myplugin_activate() {
    $buf = "<?php\\n"
        . "/*\\n"
        . " * Template Name: generated template\\n"
        . " */\\n"
        . "?>\\n"
        . "Hello world\\n";

    $handle = fopen( get_stylesheet_directory() . \'/tpl-plugin.php\', \'w\' );
    fwrite( $handle, $buf );
    fclose( $handle );
}
register_activation_hook( __FILE__, \'myplugin_activate\' );