您可以使用PHP的fgetcsv() 或str_getcsv() 函数解析上载的CSV文件。您的CSV将需要包含一个带有帖子ID的列，以及与自定义字段名匹配的列。循环浏览CSV，并为每行更新该帖子的自定义字段，使用update_post_meta()

http://php.net/manual/en/function.fgetcsv.php

http://php.net/manual/en/function.str-getcsv.php

http://codex.wordpress.org/Function_Reference/update_post_meta

请参阅教程，其中解释了如何从CSV读取数据，以及如何创建和更新现有帖子。它还解释了如何更新acf字段。

http://www.pearlbells.co.uk/insert-udpate-wordpress-post-programmatically/

function postExists($postCSVContent,$parentId , $mydb) {

$mydb->get_results($mydb->prepare(\'SELECT ID FROM `wp_posts` WHERE ID = %d\',$postCSVContent[0]));

if( $mydb->num_rows >  0) {

    echo \'Post \'.$postCSVContent[0].\' exist\'.PHP_EOL;
    $template_file = get_post_meta( $postCSVContent[0], \'_wp_page_template\', true );
    echo \'Template File : \'.$template_file.PHP_EOL;

    $updatePost = array(   
        \'ID\' => $postCSVContent[0],
        \'post_title\'    => $postCSVContent[\'1\'],
        \'post_content\'  => $postCSVContent[\'2\'],
        \'post_type\' => \'doors\',
        \'post_status\'   => \'publish\',
        \'post_author\'   => 1
    );

    wp_update_post( $updatePost );

    update_post_meta( $postCSVContent[0], \'_wp_page_template\', $template_file );
    updateAcf( $postCSVContent , $postCSVContent[0] );

}
else
{
    echo \'Post \'.$postCSVContent[0].\' is not existing\'.PHP_EOL;        
    echo \'Post parent \'.$parentId.PHP_EOL;

    $newIds = wp_insert_post( array(
            \'post_title\' => $postCSVContent[\'1\'],
            \'post_content\' => $postCSVContent[\'2\'],
            \'post_type\' => \'doors\',
            \'post_status\' => \'publish\',        
            \'post_author\'   => 1,
            \'post_parent\' => $parentId
    ));

    updateAcf( $postCSVContent , $newIds );
    return $newIds;

}