Custom Post type – how to get checkbox to update meta field to null

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I have 7 meta fields for a custom post type in WordPress. These 7 in particular are days of the week (Sunday thru Saturday) and have checkboxes for each. I’ve successfully gotten the checkbox to POST when the value is “On”, however when I return to the edit page and try to deselect, the value stays the same in the database.

Here is what I have for each item input:

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 <li><input type="checkbox" name="sunday" <?php if( $meta_sunday == true ) { ?>checked="checked"<?php } ?>" /> Sunday<br /></li>

And my update lines: 

if(!isset($_POST["sunday"])):
    return $post;
    endif;
    update_post_meta($post->ID, "sunday", $_POST["sunday"] );
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3 comments

  1. It appears the post meta is not being cleared for ‘sunday’ when the checkbox is unchecked.

    If( isset($_POST['sunday']) ){
    update_post_meta($post->ID, "sunday", $_POST["sunday"] );
}else{
    delete_post_meta($post->ID, "sunday");
}
return $post;

    Or you can set the value to false

    If( isset($_POST['sunday']) ){
    update_post_meta($post->ID, "sunday", true );
}else{
    update_post_meta($post->ID, "sunday", false );
}
return $post;

  2. Unchecked checkboxes are not set in the $_POST, so you’d have to empty their meta field.

    Something like this should work :

     $sunday = ( isset( $_POST['sunday'] ) ) ? $_POST['sunday'] : "";
 update_post_meta( $post->ID, 'sunday', $sunday );

  3. Unchecked checkboxes are not set in the $_POST, they are set in $_REQUEST,
    you can set checkbox value of custom post type like this:

    if ( isset( $_REQUEST['inprint'] ) ) {
   update_post_meta($post_id, '_inprint', TRUE);
 } else {
   update_post_meta($post_id, '_inprint', FALSE);
 }

    and get checkbox value like this:

    global $post;

$inprint= get_post_meta($post->ID, '_inprint', true);

<input type="checkbox" name="inprint" value='1'<?php checked(1, $inprint); ?> />