The think is I want to display on front-end of my WP the custom posts which has specific terms, but I have problem to get term_id of specific taxonomies using foreach loop. Im using fresh WP installation and Im working with Twenty twenty theme.
So first I create custom post type “devices” in my function.php, next I created taxonomy “copy_device” with terms “new”, “used”, “color”, “wb”. So I want to display for example all “new colour copy devices” but not “used colour copy devices”.
I`m trying to display the custom post type with specific terms on front-end so I did the code below. But I get nothing… If I remove if statement “if ( $terms && ! is_wp_error( $terms ) ){” in page.php I get the error “Warning: Invalid argument supplied for foreach() in /(…)/public_html/wp-content/themes/twentytwenty/page.php on line 43”
Array ( )
line 43 is “foreach ( $terms as $term ) {“
FUNCTION.php
function td_devices_posttype() {
$labels = array(
'name' => _x( 'Devices', 'Post Type General Name', 'textdomain' ),
'singular_name' => _x( 'Device', 'Post Type Singular Name', 'textdomain' ),
'menu_name' => esc_html__( 'Devices', 'textdomain' ),
'parent_item_colon' => esc_html__( 'Parent Device', 'textdomain' ),
'all_items' => esc_html__( 'All Devices', 'textdomain' ),
'view_item' => esc_html__( 'View Devices', 'textdomain' ),
'add_new_item' => esc_html__( 'Add New Devices', 'textdomain' ),
'add_new' => esc_html__( 'Add New', 'textdomain' ),
'edit_item' => esc_html__( 'Edit Devices', 'textdomain' ),
'update_item' => esc_html__( 'Update Devices', 'textdomain' ),
'search_items' => esc_html__( 'Search Devices', 'textdomain' ),
'not_found' => esc_html__( 'Not found', 'textdomain' ),
'not_found_in_trash' => esc_html__( 'Not found in Trash', 'textdomain' )
);
$args = array(
'label' => esc_html__( 'devices', 'textdomain' ),
'description' => esc_html__( 'All devices you have', 'textdomain' ),
'labels' => $labels,
'taxonomies' => array( 'copy_device'),
'hierarchical' => false,
'public' => true,
'show_ui' => true,
'show_in_menu' => true,
'show_in_nav_menus' => true,
'show_in_admin_bar' => true,
'menu_position' => 100,
'can_export' => true,
'has_archive' => esc_html__( 'devices' ),
'exclude_from_search' => false,
'publicly_queryable' => true,
'query_var' => true,
'show_admin_column' => true,
'capability_type' => 'post',
'rewrite' => array('slug' => 'devices'),
'supports' => array( 'title','editor','thumbnail', 'custom-fields')
);
register_post_type( 'devices', $args );
}
add_action( 'init', 'td_devices_posttype' );
// custom taxonomies Copy devices
function td_posttype_taxonomy() {
$labels = array(
'name' => 'Copy Devices',
'singular_name' => 'Copy Device',
'search_items' => 'Search items',
'all_items' => 'All items',
'parent_item' => 'Parent item',
'parent_item_colon' => 'Parent item colon:',
'edit_item' => 'Edit item',
'update_item' => 'Update item',
'add_new_item' => 'Add new item',
'new_item_name' => 'New item name',
'menu_name' => 'Copy Devices'
);
$args = array (
'hierarchical' => true,
'labels' => $labels,
'show_ui' => true,
'show_admin_column' => true,
'show_in_rest' => true,
'query_var' => true,
'rewrite' => array( 'slug' => 'copy-device')
);
register_taxonomy( 'copy_device', array( 'devices' ), $args );
}
add_action('init', 'td_posttype_taxonomy');
In PAGE.php I have the following code:
// trying to hook terms ID`s (Not working?)
$termID = array();
$terms = get_the_terms($post->ID, 'copy_device');
if ( $terms && ! is_wp_error( $terms ) ){
foreach ( $terms as $term ) {
$termID[] = $term->term_id;
}
echo '<pre>'; print_r(array_values($termID)); echo '</pre>';
}
// Loop and return terms
foreach ( $categories as $categorie ):
// set up a new query
$args = new WP_Query(
array(
'post_type' => 'devices',
'tax_query' => array(
array(
'taxonomy' => 'copy_device',
'terms' => array( 'new', 'colour' ),
'field' => 'slug',
'hide_empty' => false,
)
)
)
);
?>
<h3><?php echo $categorie->name; ?></h3>
<ul>
<?php while ($args->have_posts()) : $args->the_post(); ?>
<li><?php the_title(); ?></li>
<?php endwhile; ?>
</ul>
<?php
$args = null;
wp_reset_postdata();
endforeach;
?>
if I do the following:
array(
'taxonomy' => esc_html__('copy_device'),
'hide_empty' => true,
)
);?>
I get:
Array ( [0] => WP_Term Object ( [term_id] => 12 [name] => BW [slug] => bw [term_group] => 0 [term_taxonomy_id] => 12 [taxonomy] => copy_device [description] => [parent] => 9 [count] => 1 [filter] => raw ) [1] => WP_Term Object ( [term_id] => 11 [name] => Colour [slug] => colour [term_group] => 0 [term_taxonomy_id] => 11 [taxonomy] => copy_device [description] => [parent] => 9 [count] => 1 [filter] => raw ) [2] => WP_Term Object ( [term_id] => 9 [name] => New [slug] => new [term_group] => 0 [term_taxonomy_id] => 9 [taxonomy] => copy_device [description] => [parent] => 0 [count] => 2 [filter] => raw ) [3] => WP_Term Object ( [term_id] => 10 [name] => Used [slug] => used [term_group] => 0 [term_taxonomy_id] => 10 [taxonomy] => copy_device [description] => [parent] => 0 [count] => 1 [filter] => raw ) )
I have spend so many days trying to make this work. I was reading codex, forums, web sites and was experimentig with diffrent approach, but I failed… Is there any hardcore member who can help me out to make this work?
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Answer
Use this code:
$args = array( 'post_type' => 'devices');
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
$terms = get_the_terms( get_the_id(), 'taxonomy');
foreach ( $terms as $term ) {
$termID[] = $term->term_id;
}
echo $termID[0]; `
endwhile;
`