options - save multi-select input using update_option for plugin

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Trying to save some plugin data to the wpdb using the update_option method. This code works fine for my single value ad_url, but fails for my array exclude_posts. The POST data in Chrome dev panel shows exclude_posts[] getting a value of 5, but nothing is going into the wpdb.

options.php

<form method="post" action="options.php">
<?php
    settings_fields('insert-video-ad-settings');
    do_settings_sections('insert-video-ad-settings');
?>
    <input id=adurl type="textarea" name="ad_url" autocomplete="off" value="<?php
    echo get_option('ad_url');
    ?>"/>

<?php
if(isset($_POST['exclude_posts'])) {
     $exclude_posts = $_POST['exclude_posts'];
}

if( isset( $exclude_posts ) )
{
   update_option( 'exclude_posts', $exclude_posts );
}
else
{
   delete_option( 'exclude_posts' );
}
?>

<select id="exclude_posts" name="exclude_posts[]" multiple="multiple">
       <?php
       $postslist = get_posts(array(
          'order' => 'ASC',
          'orderby' => 'date'
       ));
       $exclude = get_option('exclude_posts');
       If(!$exclude){
          $exclude=array();
       }
  if ($postslist) {
    global $post;
    foreach ($postslist as $post)
          {
          ?>
             <option value="<?php echo $post->ID; ?>" <?php echo ( in_array( $post->ID, $exclude ) ? 'selected' : '' ); ?> >
                <?php echo $post->post_title; ?>
             </option>
          <?php
          }
        }
       ?>
</select>

myplugin.php

add_action('admin_init', 'update_ad_url');

if (!function_exists("update_ad_url")) {
    function update_ad_url()
    {
        register_setting('insert-video-ad-settings', 'ad_url');
    }
}

add_action('admin_init', 'update_exclude_posts');

if (!function_exists("update_exclude_posts")) {
    function update_exclude_posts()
    {
        register_setting('insert-video-ad-settings', 'exclude_posts');
    }
}

Trying to save some plugin data to the wpdb using the update_option method. This code works fine for my single value ad_url, but fails for my array exclude_posts. The POST data in Chrome dev panel shows exclude_posts[] getting a value of 5, but nothing is going into the wpdb.

options.php

<form method="post" action="options.php">
<?php
    settings_fields('insert-video-ad-settings');
    do_settings_sections('insert-video-ad-settings');
?>
    <input id=adurl type="textarea" name="ad_url" autocomplete="off" value="<?php
    echo get_option('ad_url');
    ?>"/>

<?php
if(isset($_POST['exclude_posts'])) {
     $exclude_posts = $_POST['exclude_posts'];
}

if( isset( $exclude_posts ) )
{
   update_option( 'exclude_posts', $exclude_posts );
}
else
{
   delete_option( 'exclude_posts' );
}
?>

<select id="exclude_posts" name="exclude_posts[]" multiple="multiple">
       <?php
       $postslist = get_posts(array(
          'order' => 'ASC',
          'orderby' => 'date'
       ));
       $exclude = get_option('exclude_posts');
       If(!$exclude){
          $exclude=array();
       }
  if ($postslist) {
    global $post;
    foreach ($postslist as $post)
          {
          ?>
             <option value="<?php echo $post->ID; ?>" <?php echo ( in_array( $post->ID, $exclude ) ? 'selected' : '' ); ?> >
                <?php echo $post->post_title; ?>
             </option>
          <?php
          }
        }
       ?>
</select>

myplugin.php

add_action('admin_init', 'update_ad_url');

if (!function_exists("update_ad_url")) {
    function update_ad_url()
    {
        register_setting('insert-video-ad-settings', 'ad_url');
    }
}

add_action('admin_init', 'update_exclude_posts');

if (!function_exists("update_exclude_posts")) {
    function update_exclude_posts()
    {
        register_setting('insert-video-ad-settings', 'exclude_posts');
    }
}

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Share Improve this question asked Sep 16, 2018 at 19:15 user255406user255406 11122 bronze badges

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1 Answer 1

Sorted by: Reset to default 0

If $_POST['exclude_posts'] is an array but you need to store it as a string, you can always use a function like serialize() and unserialize() to turn it into a string and vice versa.

http://php.net/manual/en/function.serialize.php

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