在WordPress中，如果你想要通过PHP来更新自定义分类法（taxonomy）的description字段，你可以使用wp_update_term函数。以下是一个示例，展示了如何通过PHP更新自定义分类法的description：
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<pre class="prettyprint"><span class="pun"><?</span><span class="pln">php
</span><span class="com">// 自定义分类法的名称，例如 'my_custom_taxonomy' </span><span class="pln">
$taxonomy </span><span class="pun">=</span> <span class="str">'my_custom_taxonomy'</span><span class="pun">;</span>
<span class="com">// 要更新的分类的ID </span><span class="pln">
$term_id </span><span class="pun">=</span> <span class="lit">123</span><span class="pun">;</span>
<span class="com">// 新的description </span><span class="pln">
$new_description </span><span class="pun">=</span> <span class="str">'这是新的描述'</span><span class="pun">;</span>
<span class="com">// 使用</span><span class="wp_keywordlink_affiliate"><a title="View all posts in wp_update_term" href="https://www.mobantu.com/tag/wp_update_term" target="_blank" rel="noopener"><span class="com">wp_update_term</span></a></span><span class="com">函数来更新description </span><span class="pln">
$args </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span>
<span class="str">'description'</span> <span class="pun">=></span><span class="pln"> $new_description
</span><span class="pun">);</span><span class="pln">
$result </span><span class="pun">=</span><span class="pln"> wp_update_term</span><span class="pun">(</span><span class="pln">$term_id</span><span class="pun">,</span><span class="pln"> $taxonomy</span><span class="pun">,</span><span class="pln"> $args</span><span class="pun">);</span>
<span class="kwd">if</span> <span class="pun">(</span><span class="pln">is_wp_error</span><span class="pun">(</span><span class="pln">$result</span><span class="pun">))</span> <span class="pun">{</span>
<span class="com">// 如果有错误，处理错误 </span><span class="pln">
echo </span><span class="str">'更新失败: '</span> <span class="pun">.</span><span class="pln"> $result</span><span class="pun">-></span><span class="pln">get_error_message</span><span class="pun">();</span>
<span class="pun">}</span> <span class="kwd">else</span> <span class="pun">{</span><span class="pln">
echo </span><span class="str">'更新成功!'</span><span class="pun">;</span>
<span class="pun">}</span>
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在上面的代码中，请确保替换$taxonomy变量的值为你的自定义分类法的名称，设置正确的$term_id，以及你想要设置的新description。
注意：这段代码应该在WordPress环境中运行，例如在主题的functions.php文件中，或者作为一个自定义的插件。不要直接在WordPress之外的PHP环境中运行这段代码，因为它依赖于WordPress的函数库。
此外，为了安全起见，请确保你有适当的权限来执行这些操作，并且始终在生产环境中备份你的数据库和文件，以防止任何不可预见的问题。
