A proper way to prepare IN Query in WordPress

<?php | |
global $wpdb; | |
if ( is_array( $ids ) ) { | |
$in_str_arr = array_fill( 0, count( $ids ), '%d' ); | |
$in_str = join( ',', $in_str_arr ); | |
$form_id_where = $wpdb->prepare( "ID IN ($in_str)", $ids ); | |
} else { | |
$form_id_where = $ids> 0 ? $wpdb->prepare( 'ID=%d', $ids ) : ''; | |
} |