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Example code shows how to register a post type and add basic metaboxes.
<?php
/**
* Example code for tutorial post on custom meta boxes:
* https://wptheming.com/2010/08/custom-metabox-for-post-type/
*/
/**
* Registers the event post type.
*/
function wpt_event_post_type() {
$labels = array(
'name' => __( 'Events' ),
'singular_name' => __( 'Event' ),
'add_new' => __( 'Add New Event' ),
'add_new_item' => __( 'Add New Event' ),
'edit_item' => __( 'Edit Event' ),
'new_item' => __( 'Add New Event' ),
'view_item' => __( 'View Event' ),
'search_items' => __( 'Search Event' ),
'not_found' => __( 'No events found' ),
'not_found_in_trash' => __( 'No events found in trash' )
);
$supports = array(
'title',
'editor',
'thumbnail',
'comments',
'revisions',
);
$args = array(
'labels' => $labels,
'supports' => $supports,
'public' => true,
'capability_type' => 'post',
'rewrite' => array( 'slug' => 'events' ),
'has_archive' => true,
'menu_position' => 30,
'menu_icon' => 'dashicons-calendar-alt',
'register_meta_box_cb' => 'wpt_add_event_metaboxes',
);
register_post_type( 'events', $args );
}
add_action( 'init', 'wpt_event_post_type' );
/**
* Adds a metabox to the right side of the screen under the “Publish” box
*/
function wpt_add_event_metaboxes() {
add_meta_box(
'wpt_events_location',
'Event Location',
'wpt_events_location',
'events',
'side',
'default'
);
}
/**
* If you wanted to have two sets of metaboxes.
*/
function add_events_metaboxes_v2() {
add_meta_box(
'wpt_events_date',
'Event Date',
'wpt_events_date',
'events',
'side',
'default'
);
add_meta_box(
'wpt_events_location',
'Event Location',
'wpt_events_location',
'events',
'normal',
'high'
);
}
/**
* Output the HTML for the metabox.
*/
function wpt_events_location() {
global $post;
// Nonce field to validate form request came from current site
wp_nonce_field( basename( __FILE__ ), 'event_fields' );
// Get the location data if it's already been entered
$location = get_post_meta( $post->ID, 'location', true );
// Output the field
echo '<input type="text" name="location" value="' . esc_textarea( $location ) . '" class="widefat">';
}
/**
* Save the metabox data
*/
function wpt_save_events_meta( $post_id, $post ) {
// Return if the user doesn't have edit permissions.
if ( ! current_user_can( 'edit_post', $post_id ) ) {
return $post_id;
}
// Verify this came from the our screen and with proper authorization,
// because save_post can be triggered at other times.
if ( ! isset( $_POST['location'] ) || ! wp_verify_nonce( $_POST['event_fields'], basename(__FILE__) ) ) {
return $post_id;
}
// Now that we're authenticated, time to save the data.
// This sanitizes the data from the field and saves it into an array $events_meta.
$events_meta['location'] = esc_textarea( $_POST['location'] );
// Cycle through the $events_meta array.
// Note, in this example we just have one item, but this is helpful if you have multiple.
foreach ( $events_meta as $key => $value ) :
// Don't store custom data twice
if ( 'revision' === $post->post_type ) {
return;
}
if ( get_post_meta( $post_id, $key, false ) ) {
// If the custom field already has a value, update it.
update_post_meta( $post_id, $key, $value );
} else {
// If the custom field doesn't have a value, add it.
add_post_meta( $post_id, $key, $value);
}
if ( ! $value ) {
// Delete the meta key if there's no value
delete_post_meta( $post_id, $key );
}
endforeach;
}
add_action( 'save_post', 'wpt_save_events_meta', 1, 2 );
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