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I have successfully added custom meta tags to metaboxes on my pages. The issue I am having is when the metabox has no data it is still showing in the html. This is the code I have got, does anyone have any ideas on how to not show this?

    <!-- 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);?>">
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  • The metabox itself will show up if it is registered regardless of content. That is how meta boxes work, and I am puzzled by the need to display a meta box only if it has content. How does the meta box get content in the first place if it only shows up after it has content?
    – s_ha_dum
    Commented May 5, 2014 at 15:20
  • I think I have the code wrong. What I specifically need to is to output <meta name = "citation_title" content = "custom text"> into my header when there is data inputted into the metabox. I am going to try another way, but if someone has any ideas how to go about solving this it would be a great help! Thanks.
    – Chris
    Commented May 5, 2014 at 19:17

1 Answer 1

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1

This is really just a PHP question, but since there is no Core function to do this...

I'd use !empty(). Otherwise just echo a string.

$mcontent = get_post_meta($post->ID, "vw_citation_title", true);
if(!empty($mcontent)) {
    echo '<meta name = "citation_title" content = "''.$mcontent.'" >';
}
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