根据您的评论（并希望对问题进行编辑）：

我是这样做的：foreach ( $termchildren as $child ) { $term = get_term_by( \'id\', $child, $taxonomy_name, array( \'orderby\' => \'name\', \'hide_empty\' => 0) );

已格式化：

foreach ( $termchildren as $child ) { 
  $term = get_term_by( 
    \'id\', 
    $child, 
    $taxonomy_name, 
    array( 
      \'orderby\' => \'name\',
      \'hide_empty\' => 0
    ) 
  );

get_term_by 不接受数组作为第四个参数，或者实际上不接受任何参数。您不能只是构建参数并期望它们工作。你需要看看Codex 和the source.

此外get_term_by 而不是在这里进行排序。运行时会进行排序get_term_children, 尽管如此does not take a parameter that will order the results.

您可以对结果集进行排序：

$term_id = 61;
$taxonomy_name = \'tribe_events_cat\';
$termchildren = get_term_children( $term_id, $taxonomy_name );
$children = array();
foreach ($termchildren as $child) {
  $term = get_term_by( \'id\', $child, $taxonomy_name );
  $children[$term->name] = $term;
}
ksort($children);
// now $children is alphabetized
echo "<script type=\'text/javascript\'>function taclinkch(x){var y=document.getElementById(x).value;document.location.href=y}</script>";
echo "<form action=\'\'>  <select name=\'eventcats\' id=\'eventcats\'   onchange=\'taclinkch(this.id)\'>";
  echo "<option value=\'\'>Select a Topic</option>";
  foreach ( $children as $child ) {
    $term = get_term_by( \'id\', $child->term_id, $taxonomy_name );
    echo "<option value=\'" .  get_site_url() . "/events/category/". $term->slug." \'>" . $term->name . "</option>";
  }
echo "</select></form>";