我正在使用插件WP All Import来导入一个特殊的帖子类型。该插件包括一个动作挂钩pmxi\\u gallery\\u图像，该图像在导入后运行，将附件图像保存到post gallery。

我已将此操作包含在函数中的函数中。“我的孩子”主题中的php文件：

//After WP All Import runs this will place the attached photos in the gallery images field by post id
add_action(\'pmxi_gallery_image\', \'update_images_meta\', 10, 3);
function update_images_meta( $pid, $attid, $image_filepath ) {

// Get all the image attachments for the post
$param = array(
        \'post_parent\'       => $pid, 
        \'post_type\'         => \'attachment\', 
        \'post_mime_type\'    => \'image\'
);

$attachments = get_children( $param );

// Initialize the array
$atts = array();

// Fill the array with attachment ID\'s
foreach($attachments as $attachment) {
        $atts[] = $attachment->ID;
}

// Disable this hook which was overwrinting our changes
// remove_action( \'save_post\', \'flexible_save_details\', 10 );

// Update the post\'s meta field with the attachment arrays
update_post_meta( $pid, \'images\', $atts );
}

这将输出一组图像帖子id：

a:4:{i:0;i:38985;i:1;i:38986;i:2;i:38987;i:3;i:38983;}

我需要在id之前包含一个字符串长度，id用引号封装，因此主题使用的库的输出如下所示：

a:4:{i:0;s:4:"7613";i:1;s:4:"7615";i:2;s:4:"7616";i:3;s:4:"7618";}

$str = \'a:4:{i:0;s:4:"7613";i:1;s:4:"7615";i:2;s:4:"7616";i:3;s:4:"7618";}\';
$str = maybe_unserialize($str);
var_dump($str);
echo \'<br/>\';
var_dump(maybe_serialize($str));
echo \'<br/>\';
$str = array(
  1234,4567,8910,1112
);
var_dump(maybe_serialize($str));
echo \'<br/>\';
$str = array(
  \'1234\',\'4567\',\'8910\',\'1112\'
);
var_dump(maybe_serialize($str));

// Fill the array with attachment ID\'s
foreach($attachments as $attachment) {
        $atts[] = "$attachment->ID";
}