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Add a custom field to Media Gallery

//custom field gallery popup
/* For adding custom field to gallery popup */
function rt_image_attachment_fields_to_edit($form_fields, $post) {
    // $form_fields is a an array of fields to include in the attachment form
	// $post is nothing but attachment record in the database
	//     $post->post_type == 'attachment'
	// attachments are considered as posts in WordPress. So value of post_type in wp_posts table will be attachment
	// now add our custom field to the $form_fields array
	// input type="text" name/id="attachments[$attachment->ID][custom1]"
	$form_fields["rt-image-link"] = array(
		"label" => __("Slider Picture Link"),
		"input" => "text", // this is default if "input" is omitted
		"value" => get_post_meta($post->ID, "_rt-image-link", true),
                "helps" => __("Link zum Bild Schieberegler auf der Titelseite."),
	);
   return $form_fields;
}
// now attach our function to the hook
add_filter("attachment_fields_to_edit", "rt_image_attachment_fields_to_edit", null, 2);
function rt_image_attachment_fields_to_save($post, $attachment) {
	// $attachment part of the form $_POST ($_POST[attachments][postID])
        // $post['post_type'] == 'attachment'
	if( isset($attachment['rt-image-link']) ){
		// update_post_meta(postID, meta_key, meta_value);
		update_post_meta($post['ID'], '_rt-image-link', $attachment['rt-image-link']);
	}
	return $post;
}
// now attach our function to the hook.
add_filter("attachment_fields_to_save", "rt_image_attachment_fields_to_save", null , 2);
https://snipt.net/embed/817100513e228d77971b55ecbc4de3c5/
/raw/817100513e228d77971b55ecbc4de3c5/
817100513e228d77971b55ecbc4de3c5
php
PHP
30
2019-06-19T14:54:22
True
False
False
/api/public/snipt/42978/
add-a-custom-field-to-media-gallery
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="x">//custom field gallery popup</span> </span><span id="L-2"><a name="L-2"></a><span class="x">/* For adding custom field to gallery popup */</span> </span><span id="L-3"><a name="L-3"></a><span class="x">function rt_image_attachment_fields_to_edit($form_fields, $post) {</span> </span><span id="L-4"><a name="L-4"></a><span class="x"> // $form_fields is a an array of fields to include in the attachment form</span> </span><span id="L-5"><a name="L-5"></a><span class="x"> // $post is nothing but attachment record in the database</span> </span><span id="L-6"><a name="L-6"></a><span class="x"> // $post-&gt;post_type == &#39;attachment&#39;</span> </span><span id="L-7"><a name="L-7"></a><span class="x"> // attachments are considered as posts in WordPress. So value of post_type in wp_posts table will be attachment</span> </span><span id="L-8"><a name="L-8"></a><span class="x"> // now add our custom field to the $form_fields array</span> </span><span id="L-9"><a name="L-9"></a><span class="x"> // input type=&quot;text&quot; name/id=&quot;attachments[$attachment-&gt;ID][custom1]&quot;</span> </span><span id="L-10"><a name="L-10"></a><span class="x"> $form_fields[&quot;rt-image-link&quot;] = array(</span> </span><span id="L-11"><a name="L-11"></a><span class="x"> &quot;label&quot; =&gt; __(&quot;Slider Picture Link&quot;),</span> </span><span id="L-12"><a name="L-12"></a><span class="x"> &quot;input&quot; =&gt; &quot;text&quot;, // this is default if &quot;input&quot; is omitted</span> </span><span id="L-13"><a name="L-13"></a><span class="x"> &quot;value&quot; =&gt; get_post_meta($post-&gt;ID, &quot;_rt-image-link&quot;, true),</span> </span><span id="L-14"><a name="L-14"></a><span class="x"> &quot;helps&quot; =&gt; __(&quot;Link zum Bild Schieberegler auf der Titelseite.&quot;),</span> </span><span id="L-15"><a name="L-15"></a><span class="x"> );</span> </span><span id="L-16"><a name="L-16"></a><span class="x"> return $form_fields;</span> </span><span id="L-17"><a name="L-17"></a><span class="x">}</span> </span><span id="L-18"><a name="L-18"></a><span class="x">// now attach our function to the hook</span> </span><span id="L-19"><a name="L-19"></a><span class="x">add_filter(&quot;attachment_fields_to_edit&quot;, &quot;rt_image_attachment_fields_to_edit&quot;, null, 2);</span> </span><span id="L-20"><a name="L-20"></a><span class="x">function rt_image_attachment_fields_to_save($post, $attachment) {</span> </span><span id="L-21"><a name="L-21"></a><span class="x"> // $attachment part of the form $_POST ($_POST[attachments][postID])</span> </span><span id="L-22"><a name="L-22"></a><span class="x"> // $post[&#39;post_type&#39;] == &#39;attachment&#39;</span> </span><span id="L-23"><a name="L-23"></a><span class="x"> if( isset($attachment[&#39;rt-image-link&#39;]) ){</span> </span><span id="L-24"><a name="L-24"></a><span class="x"> // update_post_meta(postID, meta_key, meta_value);</span> </span><span id="L-25"><a name="L-25"></a><span class="x"> update_post_meta($post[&#39;ID&#39;], &#39;_rt-image-link&#39;, $attachment[&#39;rt-image-link&#39;]);</span> </span><span id="L-26"><a name="L-26"></a><span class="x"> }</span> </span><span id="L-27"><a name="L-27"></a><span class="x"> return $post;</span> </span><span id="L-28"><a name="L-28"></a><span class="x">}</span> </span><span id="L-29"><a name="L-29"></a><span class="x">// now attach our function to the hook.</span> </span><span id="L-30"><a name="L-30"></a><span class="x">add_filter(&quot;attachment_fields_to_save&quot;, &quot;rt_image_attachment_fields_to_save&quot;, null , 2);</span> </span></pre></div> </td></tr></table>
custom, field, gallery, media, wordpress