Analysis of get_post_custom function usage in WordPress development

Same as get_post_meta(), the custom field used to return the post deserves a function, except that the get_post_custom() function is simpler to use, and you don’t even need to set any parameters if used in a loop.

In fact, the basic implementation of the get_post_custom() function is similar to get_post_meta()~

get_post_custom() uses

get_post_custom($postid);

and only accepts one parameter
$postid article id;

Example demonstration

 if (have_posts()) :
 
 while (have_posts()) : the_post(); 
  var_dump(get_post_custom());
 
 endwhile; 
 
 endif;

output The result is as follows: (if the following fields are set)

array(4) {
[“_edit_last”]=>
array(1) {
[0]=>
string(1) “1”
}
[“_edit_lock”]=>
array(1) {
[0]=>
string(12) “1342451729:1”
}
[“_thumbnail_id”]=>
array(1) {
[0]=>
string(3) “228”
}
[“xzmeta”]=>
array(2) {
[0]=>
string(3) “xz1”
[1]=>
string(3) “xz2”
}
}

get_post_custom_values ​​and get_post_custom_keys

Because custom fields are divided into key values ​​(keys) and custom field values ​​(values), sometimes we need to obtain these two separately value, so two functions, get_post_custom_values ​​and get_post_custom_keys, are derived from WordPress. As for the meaning, I really haven’t found much significance. Except for the certain use when deleting custom fields in batches, I really don’t think about it. Where it can be used, it may have a very important meaning in a vast CMS theme.

I wrote about the get_post_custom function and get_post_meta function before. I thought privately that there are not many functions related to custom fields anyway, so I sorted it out and simply wrote down all the functions related to custom fields, excluding functions of course. Some basic implementation code.
get_post_custom_values ​​is used to get the value of the specified custom field of the current article and return it in the form of an array.

 while (have_posts()) : the_post(); 
  var_dump(get_post_custom_values(‘xzmeta'));
 endwhile; 
 
 endif;

will roughly return the following results

(if the custom field is set)

array(2) {
[0]=>
string(3) “xz1”
[1]=>
string(3) “xz2”
}

get_post_custom_keys is used to get the key values ​​of all custom fields in the current article.

 if (have_posts()) :
 while (have_posts()) : the_post(); 
  var_dump(get_post_custom_keys());
 endwhile; 
 endif;

You will roughly get the following results:
(if the custom field is set)

array(4) {
[0]=>
string(10) “_edit_last”
[1]=>
string(10) “_edit_lock”
[2]=>
string(13) “_thumbnail_id”
[3]=>
string(6) “xzmeta”
}

The above introduces the analysis of the use of get_post_custom function in WordPress development, including relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.