我一直在调查行动和挂钩等。。。来自wordpress，但似乎做不到一件非常简单的事情。我只想在每次更新帖子时执行一个函数，在该函数中，我想要保存时更改的术语的名称。因此，可能是某种前后比较的术语？？
谁能给我一个进去的方向的提示吗？我从以下内容开始：
add_action(\'save_post\', \'myFunction\');
谢谢：）
创建一个函数，该函数接收已在自定义帖子类型中更改的分类术语
3 个回复
最合适的回答,由SO网友:Stephen Harris 整理而成
WordPress更新帖子的分类术语后，会触发以下操作：
set_object_terms
分配给帖子（或根据5添加）的对象ID（可能是其slug或term ID）
问题1
很遗憾，无法知道该对象是否引用了帖子或其他内容（如用户）。这可能是一种set_object_terms 只有当你能确定它下次被解雇时，它才是指一篇帖子。问题2
传递的ID是分类术语ID，而不是术语ID-大多数WordPress函数都使用术语ID。因此，您可能需要从分类术语ID中获取术语ID（和分类），才能执行任何有用的操作。一个潜在的解决方法是，因为我们知道分类法，列出所有术语并执行一个简单的foreach 循环并过滤它们。Better suggestions are welcome以下内容未经测试
add_action(\'set_object_terms\',\'wpse61678_terms_changed\',10,6);
function wpse61678_terms_changed($object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids){
//Note problem 1 - we might not necessarily know what $object_id refers to.
//Added terms are specified terms, that did not already exist
$added_tt_ids = array_diff($tt_ids, $old_tt_ids);
if( $append ){
//If appending terms - nothing was removed
$removed_tt_ids = array();
}else{
//Removed terms will be old terms, that were not specified in $tt_ids
$removed_tt_ids = array_diff($old_tt_ids, $tt_ids);
}
/*Note problem 2, we would preferably like the term objects / IDs,
Currently we have the taxonomy term IDs*/
//Get all terms
$all_terms = get_terms( $taxonomy, array(\'hide_empty\'=>0));
$removed_terms =array()
$added_terms =array();
foreach( $all_terms as $term ){
$tt_id = (int) $term->term_taxonomy_id;
if( in_array( $tt_id, $removed_tt_ids) ){
$removed_terms[] = $term;
}elseif( in_array( $tt_id, $added_tt_ids) ){
$added_terms[] = $term;
}
}
//$added_terms contains added term objects
//$removed_terms contains removed term objects
}
SO网友:Adam
如果有potential 使用的问题set_object_terms Stephen指出的钩子，可能钩住pre_post_update 然后接着是wp_insert_post就足够了，
add_action(\'pre_post_update\',\'get_terms_before_update\');
function get_terms_before_update(){
$terms_before = get_the_terms( $id, $taxonomy );
//do something else if required...
return $terms_before;
}
add_action(\'wp_insert_post\',\'get_terms_after_update\');
function get_terms_after_update(){
//pass in $terms_before from get_terms_before_update() function
//compare terms
}
SO网友:Jason Wisely
这是Stephen答案的更新，基于新的get\\u terms\\u by function，并假设我们知道需要什么样的分类法。
add_action(\'set_object_terms\',\'save_terms\',10,6);
function save_terms($object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids) {
//Assuming we only want terms from specific taxonomy
//If not simply remove this conditional
$our_taxonomy = \'categories\';
if($taxonomy == $our_taxonomy){
//Added terms are specified terms, that did not already exist
$added_tt_ids = array_diff($tt_ids, $old_tt_ids);
if ($append) {
//If appending terms - nothing was removed
$removed_tt_ids = array();
} else {
//Removed terms will be old terms, that were not specified in $tt_ids
$removed_tt_ids = array_diff($old_tt_ids, $tt_ids);
}
/* Note problem 2 by Stephen, we would preferably like the term objects / IDs,
Currently we have the taxonomy term IDs */
foreach($added_tt_ids as $term){
$added_terms[] = get_term_by( \'term_taxonomy_id\',$term,$taxonomy);
}
foreach($removed_tt_ids as $term){
$removed_terms[] = get_term_by( \'term_taxonomy_id\',$term,$taxonomy);
}
//$added_terms contains added term objects
//$removed_terms contains removed term objects
}
}
结束