Meta Tags by Meta Box

我已经成功地将自定义元标记添加到我页面上的元框中。我遇到的问题是，当metabox没有数据时，它仍然显示在html中。这是我得到的代码，有人对如何不显示这一点有什么想法吗？

    <!-- Google Meta Tags -->
<meta name="citation_title" content="<?php if(get_post_meta($post->ID, "vw_citation_title", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_title", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_1", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_1", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_2", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_2", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_3", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_3", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_4", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_4", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_5", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_5", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_6", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_6", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_7", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_7", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_8", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_8", true);?>">
<meta name="citation_author" content="<?php if(get_post_meta($post->ID, "vw_citation_author_9", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_author_9", true);?>">
<meta name="citation_publication_date" content="<?php if(get_post_meta($post->ID, "vw_citation_publication_date", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_publication_date", true);?>">
<meta name="citation_journal_title" content="<?php if(get_post_meta($post->ID, "vw_citation_journal_title", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_journal_title", true);?>">
<meta name="citation_volume" content="<?php if(get_post_meta($post->ID, "vw_citation_volume", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_volume", true);?>">
<meta name="citation_issue" content="<?php if(get_post_meta($post->ID, "vw_citation_issue", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_issue", true);?>">
<meta name="citation_firstpage" content="<?php if(get_post_meta($post->ID, "vw_citation_first_page", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_first_page", true);?>">
<meta name="citation_lastpage" content="<?php if(get_post_meta($post->ID, "vw_citation_last_page", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_last_page", true);?>">
<meta name="citation_pdf_url" content="<?php if(get_post_meta($post->ID, "vw_citation_pdf_url", true) !=\'\' ) echo get_post_meta($post->ID, "vw_citation_pdf_url", true);?>">

删除由另一个插件-WooCommerce注册的Metabox

我正在尝试删除WooCommerce添加的gallery metabox-它已在更新中添加，但我已经有了gallery metabox，我不想混淆客户端。显然，我可以破解插件，但我想从功能上做到这一点。php我尝试过：function remove_my_meta_boxes() { remove_meta_box( \'woocommerce-product-images\', \'product\', \'side\'); } add_action( \'admin_

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删除由另一个插件-WooCommerce注册的Metabox