如何以及在何处获取“密钥”，然后在get_post_meta（）中使用它？
[英]How and where to get 'key' and then use it in get_post_meta()?
问题描述
I am trying to use the get_post_meta($post-id, $key) method, but i run into some problem becuase I do not know the key name for the post. 
我正在尝试使用get_post_meta（$ post-id，$ key）方法，但是由于我不知道该帖子的键名，因此遇到了一些问题。 How can I get the key? 我如何获得钥匙？ This code is simply an example for the get_post_meta($post-id, $key) function... 这段代码只是get_post_meta（$ post-id，$ key）函数的示例...
<?php
$current_post_meta = get_post_meta(get_the_id(), '$the_key_i_do_not_know');
?>
<html>
<div class="container">
<?php
echo $current_post_meta[0]; //This echoes the post-id of posts with the same key as $the_key_i_do_not_know.
?>
</div>
</html>
If you have a script or some sort of way of getting a post's all keys that would be great thanks! 如果您有脚本或某种方式来获取帖子的所有键，那将非常感谢！
Best regards, Ledung. 最好的问候，Ledung。
2 个解决方案
解决方案1
1 2017-10-02 14:05:28
You can use get_post_custom_keys in order to get all of the meta keys related to the post. 您可以使用get_post_custom_keys来获取与帖子相关的所有元键。 It returns an array. 它返回一个数组。 Here's an example from codex: 这是来自法典的一个例子：
<?php
$custom_field_keys = get_post_custom_keys();
foreach ( $custom_field_keys as $key => $value ) {
$valuet = trim($value);
if ( '_' == $valuet{0} )
continue;
echo $key . " => " . $value . "<br />";
}
?>
And here's the link to the codex: https://developer.wordpress.org/reference/functions/get_post_custom_keys/ 这是指向法典的链接： https : //developer.wordpress.org/reference/functions/get_post_custom_keys/
解决方案2
0 2017-10-02 14:01:40
The get_post_meta() function without a key, returns an array of all post meta for a specific post id: 没有键的get_post_meta（）函数返回特定帖子ID的所有帖子元的数组：
$post_meta = get_post_meta(get_the_id());
print_r($post_meta); // Shows all post meta
See also: https://developer.wordpress.org/reference/functions/get_post_meta/ 另请参阅： https : //developer.wordpress.org/reference/functions/get_post_meta/
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