search-extras.php
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<?php
add_action( 'add_attachment', 'add_attachment_mime_type' );
function add_attachment_mime_type( $attachment_id ){
$post = get_post( $attachment_id );
$post_mime_type = explode(".", $post->_wp_attached_file);
update_post_meta( $attachment_id, 'file_type', end($post_mime_type) );
}
function exclude_post( $query ) {
if ( $query->is_main_query() ) {
$meta_query = $query->get('meta_query') ? $query->get('meta_query') : array();
// append yours
$meta_query[] = array(
'key' => 'exclude_from_search', // please make sure that key is correct
'value' => '1',
'compare' => '!=' // you can also try 'NOT EXISTS' comparison
);
$query->set('meta_query', $meta_query);
}
}
add_action( 'pre_get_posts', 'exclude_post' );
// apply tags to attachments
function wptp_add_tags_to_attachments() {
register_taxonomy_for_object_type( 'post_tag', 'attachment' );
}
add_action( 'init' , 'wptp_add_tags_to_attachments' );