Wordpress wp_generate_attachment_metadata打破循环

Question

我正在以编程方式将图片上传到wordpress的媒体库中。一切正常，直到我拨打wp_generate_attachment_metadata，这打破了循环，似乎导致文件被重新上传并以500 internal server error结束。

当我删除wp_generate_attachment_metadata时，脚本运行正常。

当我运行脚本并且文件已上传时wp_generate_attachment_metadata按预期工作并返回正确的ID。

private function uploadImage($image_url) {

       $upload_dir = wp_upload_dir();

       $image_data = file_get_contents($image_url);

       $filename = basename($image_url);

       if(wp_mkdir_p($upload_dir['path']))   {
        $fileExists = is_file( $upload_dir['path'] . '/' . $filename);

        $file = $upload_dir['path'] . '/' . $filename;

    } else {                                    
        $fileExists = is_file( $upload_dir['basedir'] . '/' . $filename);

        $file = $upload_dir['basedir'] . '/' . $filename;
    }

    if($fileExists) {

       global $wpdb;

       $prepare = $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE post_title LIKE '%s'", '%'.$filename.'%');

       $posts = $wpdb->get_results($prepare );

       $attach_id = $posts[0]->ID;

       if(!$attach_id) {

        $wp_filetype = wp_check_filetype($file, null );

        $attachment = array(
            'post_mime_type' => $wp_filetype['type'],
            'post_title' => sanitize_file_name($filename),
            'post_content' => '',
            'post_status' => 'inherit'
            );

        var_dump('here');
        $attach_id =  wp_insert_attachment( $attachment, $file);

       $attach_data = wp_generate_attachment_metadata( $attach_id, $file );

       wp_update_attachment_metadata( $attach_id, $attach_data );
    }

    return  $attach_id; 

    } else {

        file_put_contents($file, $image_data);

        $wp_filetype = wp_check_filetype($file, null );

        $attachment = array(
            'post_mime_type' => $wp_filetype['type'],
            'post_title' => sanitize_file_name($filename),
            'post_content' => '',
            'post_status' => 'inherit'
            );


        $attach_id =  wp_insert_attachment( $attachment, $file);

       $attach_data = wp_generate_attachment_metadata( $attach_id, $file );

        wp_update_attachment_metadata( $attach_id, $attach_data );

        return $attach_id;
    }


    } 

这是在循环中调用的：

 foreach ($property->pictures[0]->picture as $picture) {

        $imageID = $this->uploadImage($picture->filename);

        if($imageID){
          array_push($images,$imageID);  
      }