Drush script to delete a taxonomy term and its children, as well as all nodes with that term

delete_term_and_nodes.php

<?php

//Enter the taxonomy term ID you want to delete
$termid = -1;

$allterms = taxonomy_get_children($termid);
$allterms[] = $termid;

echo "Deleting $termid and its children\n";
echo "Deleting " . count($allterms) . " terms\n";

foreach($allterms as $term) {
    $term = taxonomy_term_load($term);
    $nodes = taxonomy_select_nodes($term->tid, false);
    echo $term->name . " has " . count($nodes) . " children to delete\n";
    $successful_delete = true;
    try{
        node_delete_multiple($nodes);
    }
    catch(Exception $e) {
        echo "Error deleting nodes in " . $term->name . ", check manually\n";
        $successful_delete = false;
    }
    if($successful_delete) {
        taxonomy_term_delete($term->tid);
        echo "Deleted taxonomy term " . $term->name . "\n";
    }
}

taxonomy_term_delete($termid);
echo "Parent term deleted. All set!\n";

?>