Please, backup your database before running this.

代码非常简单，并在本地WordPress中进行了测试<这个建议只是为了预防，因为我想你正在处理一个实时站点。

将代码复制到PHP文件中，将其上载到plugins文件夹并激活。

激活时，它将遍历所有posts 发布类型并检查是否有摘录

<?php
/*
    Plugin Name: AIOSEOP to Excerpt
    Plugin URI: http://wordpress.stackexchange.com/q/70990/12615
*/
register_activation_hook( __FILE__, \'wpse_70990_activation_run\' );

function wpse_70990_activation_run()
{   
    $args = array( 
        \'post_type\'   => \'post\'
    ,   \'numberposts\' => -1
    ,   \'post_status\' => published 
    );
    $posts = get_posts( $args );
    foreach ( $posts as $post )
    {
        if( \'\' == $post->post_excerpt )
        {
            $aioseop = get_post_meta( $post->ID, \'_aioseop_description\' ,true);
            if( \'\' != $aioseop )
            {
                $po = array();
                $po = get_post( $post->ID, \'ARRAY_A\' );
                $po[\'post_excerpt\'] = $aioseop;
                wp_update_post($po);
            }
        }
    }   
}