Save Multiple Checkbox on METABOX WordPress

Bob comments:

<strong>Updated function autori_metabox</strong>

public function autori_metabox( $post ) {
// Add nonce for security and authentication.
wp_nonce_field( 'autore_id_nonce_action', 'autore_id_nonce' );
// Retrieve an existing value from the database.
$autore_id = get_post_meta( $post->ID, 'autore_id', true );
global $post; // required
$args=array(
'post_type'=>'autori',
'post_per_page'=>-1,
'orderby'=> ID,
'order' => ASC
);
$custom_posts = get_posts($args);

foreach($custom_posts as $post) : setup_postdata($post);
$checkid = "-".get_the_ID()."-";
$checked = "";
if(strpos($autore_id,$checkid) !== false )
$checked = 'checked="checked"';

echo '<p><label><input type="checkbox"
name="autore_id[]"
class="check_autori_field"
value="' . get_the_ID() . '" ' . $checked . '> ' . get_the_title() . '</label><p>';
endforeach;
wp_reset_postdata();
}



Manlio Ma comments:

Hi Bob, I need to include the ID in "-ID-", because when I build the single page for CPT Autore, I need to run a loop and check all post that contains the single ID.

If I don't do this... I will have this WRONG scenario custom_field = 1218181828 .... where all ids are close and it is difficult to identify only one ID

I hope you understand my bad english ;)

Now i tried your code and:

1) doesn't save nothing
2) the slug of post change on saved and take the name of 1 autor random - amazing but is it

<blockquote>before:
mydomain.com/post-title

After saving:
mydomain.com/autore</blockquote>

Bob comments:

you can save serialized array. There is no need to save it as string.

Bob comments:

Above code works fine in my localhost.

We can discuss it over skype: thevaghela

Bob comments:


// custom post: Autori
add_action( 'init', function() {
$labels = array(
'name' => 'Autori',
'singular_name' => 'Autore',
'add_new' => 'Aggiungi nuovo',
'add_new_item' => 'Aggiungi nuovo Autore',
'edit_item' => 'Modifica Autore',
'new_item' => 'Nuovo Autore',
'all_items' => 'Tutti gli Autori',
'view_item' => 'Vedi Autore',
'search_items' => 'Cerca Autore',
'not_found' => 'No Autore found',
'not_found_in_trash' => 'No Autore found in the Trash',
'parent_item_colon' => '',
'menu_name' => 'Autori'
);
$args = array(
'labels' => $labels,
'description' => 'Autori',
'public' => true,
'menu_position' => 23,
'menu_icon' => 'dashicons-businessman',
'supports' => array( 'title', 'editor', 'thumbnail', 'excerpt', 'comments' ),
'has_archive' => true,
);
register_post_type( 'Autori', $args );
});


class Autori_Meta_Box {

public function __construct() {

if ( is_admin() ) {
add_action( 'load-post.php', array( $this, 'init_metabox' ) );
add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );
}

}

public function init_metabox() {

add_action( 'add_meta_boxes', array( $this, 'add_metabox' ) );
add_action( 'save_post', array( $this, 'save_metabox' ), 10, 2 );

}

public function add_metabox() {

add_meta_box(
'autori_meta_box_id',
'Autori',
array( $this, 'autori_metabox' ),
'post',
'side',
'high'
);

}



public function autori_metabox( $post ) {
// Add nonce for security and authentication.
wp_nonce_field( 'autore_id_nonce_action', 'autore_id_nonce' );
// Retrieve an existing value from the database.
$autore_id = get_post_meta( $post->ID, 'autore_id', true );
//print_r($autore_id);
global $post; // required
$args=array(
'post_type'=>'autori',
'post_per_page'=>-1,
'orderby'=> ID,
'order' => ASC
);
$custom_posts = get_posts($args);

foreach($custom_posts as $p) :
$checked = "";
if(is_array( $autore_id )){
if( in_array( $p->ID, $autore_id ) )
$checked = 'checked="checked"';
}

echo '<p><label><input type="checkbox"
name="autore_id[]"
class="check_autori_field"
value="' . $p->ID . '" ' . $checked . '> ' . $p->post_title . '</label><p>';
endforeach;
}

public function save_metabox( $post_id, $post ) {

// Add nonce for security and authentication.
$nonce_name = isset( $_POST['autore_id_nonce'] ) ? $_POST['autore_id_nonce'] : '';
$nonce_action = 'autore_id_nonce_action';

// Check if a nonce is set.
if ( ! isset( $nonce_name ) )
return;

// Check if a nonce is valid.
if ( ! wp_verify_nonce( $nonce_name, $nonce_action ) )
return;

// Check if the user has permissions to save data.
if ( ! current_user_can( 'edit_post', $post_id ) )
return;

// Check if it's not an autosave.
if ( wp_is_post_autosave( $post_id ) )
return;

// Check if it's not a revision.
if ( wp_is_post_revision( $post_id ) )
return;

$data = $_POST['autore_id'];
if($data)
update_post_meta( $post_id, 'autore_id', $data );


}

}

new Autori_Meta_Box;