编辑“WordPress:Function Reference/get post custom keys”

== Description ==

==描述==

Returns an array containing the keys of all custom fields of a particular post or page. See also [[WordPress:Function_Reference/get_post_custom|get_post_custom()]] and [[WordPress:Function_Reference/get_post_custom_values|get_post_custom_values()]]

返回一个数组，包含某篇文章或者网页的所有自定义fields。也看看[[WordPress:Function_Reference/get_post_custom|get_post_custom()]] 和[[WordPress:Function_Reference/get_post_custom_values|get_post_custom_values()]]

== Usage ==

==用法==

%%% <?php get_post_custom_keys($post_id); ?> %%%

%%% <?php get_post_custom_keys($post_id); ?> %%%

== Examples ==

=== Default Usage ===


==例子==
===默认用法===


The following example will set a variable (<tt>$custom_field_keys</tt>) as an array containing the keys of all custom fields in the current post, and then print it.
<pre><?php

下面的例子会将一个变数(<tt>$custom_field_keys</tt>)设置为一个数组，包含当前文章的所有自定义fields的关键词，然后再输出。
<pre><?php

  $custom_field_keys = get_post_custom_keys();
  foreach ( $custom_field_keys as $key => $value )
    echo $key . " => " . $value . "<br />";

?></pre>
If the post contains custom fields with the keys ''mykey'' and ''yourkey'', the output would be:
<div style="border:1px solid blue; width:50%; margin: 20px; padding:20px">
0 => mykey<br />
1 => yourkey<br />
2 => _edit_last<br />
3 => _edit_lock<br />
4 => _wp_page_template<br />
</div>






  $custom_field_keys = get_post_custom_keys();
  foreach ( $custom_field_keys as $key => $value )
    echo $key . " => " . $value . "<br />";

?></pre>
如果文章包含关键字为 ''mykey'' and ''yourkey''的自定义field,输出就会是:
<div style="border:1px solid blue; width:50%; margin: 20px; padding:20px">
0 => mykey<br />
1 => yourkey<br />
2 => _edit_last<br />
3 => _edit_lock<br />
4 => _wp_page_template<br />
</div>



'''''Note:''' Regardless of how many values (custom fields) are assigned to one key, that key will only appear once in this array.''
'''''注:'''不管一个关键字分配了多少参数值（自定义fields），关键字在数组中只显示一次。''
== Parameters ==

==参数==

{{Parameter|$post_id|integer|The post ID whose custom field keys will be retrieved.|optional|Current post}}

{{Parameter|$post_id|integer|The post ID whose custom field keys will be retrieved.|optional|当前文章t}}

== Related ==

==相关的==

[[WordPress:Function Reference/add post meta|add_post_meta()]], [[WordPress:Function Reference/delete post meta|delete_post_meta()]], [[WordPress:Function Reference/get post meta|get_post_meta()]], [[WordPress:Function Reference/update post meta|update_post_meta()]], [[WordPress:Function Reference/get post custom|get_post_custom()]], [[WordPress:Function Reference/get post custom values|get_post_custom_values()]]

[[WordPress:Function Reference/add post meta|add_post_meta()]], [[WordPress:Function Reference/delete post meta|delete_post_meta()]], [[WordPress:Function Reference/get post meta|get_post_meta()]], [[WordPress:Function Reference/update post meta|update_post_meta()]], [[WordPress:Function Reference/get post custom|get_post_custom()]], [[WordPress:Function Reference/get post custom values|get_post_custom_values()]]