ACF & PHP-API (WordPress): verschil tussen versies
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| + | How can you automatically manage ACF fields? In particular, fill in, delete and edit? | ||
| − | == | + | == Not directly at database level == |
| − | + | To start with some bad news: While ACF fields are stored in tables <code>wp_options</code> or <code>wp_postmeta</code>, you cannot write directly to these tables to create ACF fields. Then the 'context' is missing, eg a repeater. So you have to do it via an API call. | |
| − | == | + | == Two kinds of fields == |
| − | + | There seems to be a distinction between two kinds of ACF fields and how to approach them: | |
| + | |||
| + | * Fields that are associated with specific posts | ||
| + | * Fiels that are ''not'' asssociated with specific posts. | ||
| + | |||
| + | The distinction will be clear in the examples below. | ||
| + | |||
| + | == Retrieve a post-related field == | ||
| + | |||
| + | As an example: The home page of a site has ID=7. It has a custom field ''hero text''. How to fetch its value: | ||
<pre> | <pre> | ||
<?php | <?php | ||
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| − | + | require_once("/var/www/example.com/wp-load.php"); | |
| − | + | the_field("hero_text",7); | |
| + | </pre> | ||
| + | Output: | ||
| − | + | <pre> | |
| − | + | Eat more chips! | |
| − | + | </pre> | |
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| − | |||
| − | + | * Function <code>[[The field (ACF) | the_field()]]</code> displays the value of a field directly | |
| + | * Alternatively, function <code>[[Get field() (ACF) | get_field()]]</code> returns the value rather than directly displaying it. | ||
| − | + | == Retrieve an option field == | |
| − | + | Let's fetch the value of a field that is available through ''wp-admin » Options'': | |
| − | |||
| − | + | * Name of the field figured out by looking up its field group at ''wp-admin » Custom fields » Field Groups'': <code>webshop_country_code</code> | |
| + | * This is a scalar. Not a repeater, array or object. Just a single value | ||
| + | == See also == | ||
| − | ACF | + | * [[ACF (Advanced Custom Fields, WordPress) | ACF (general)]] |
| − | + | * [[The field (ACF) | the_field()]] | |
| − | + | * [[Get field() (ACF) | get_field()]] | |
| + | * [[Update sub field() (ACF) | update_sub_field()]] | ||
| + | * [[Update sub row() (ACF) | update_sub_row()]] | ||
| − | == | + | == Sources == |
* https://www.advancedcustomfields.com/resources/ | * https://www.advancedcustomfields.com/resources/ | ||
| − | * https://www.advancedcustomfields.com/resources/#functions - | + | * https://www.advancedcustomfields.com/resources/#functions - All PHP functions together. It's not complete, though! |
| + | * https://www.advancedcustomfields.com/resources/code-examples/ | ||
Huidige versie van 1 aug 2022 om 11:14
How can you automatically manage ACF fields? In particular, fill in, delete and edit?
Not directly at database level
To start with some bad news: While ACF fields are stored in tables wp_options or wp_postmeta, you cannot write directly to these tables to create ACF fields. Then the 'context' is missing, eg a repeater. So you have to do it via an API call.
Two kinds of fields
There seems to be a distinction between two kinds of ACF fields and how to approach them:
- Fields that are associated with specific posts
- Fiels that are not asssociated with specific posts.
The distinction will be clear in the examples below.
As an example: The home page of a site has ID=7. It has a custom field hero text. How to fetch its value:
<?php
require_once("/var/www/example.com/wp-load.php");
the_field("hero_text",7);
Output:
Eat more chips!
- Function
the_field()displays the value of a field directly - Alternatively, function
get_field()returns the value rather than directly displaying it.
Retrieve an option field
Let's fetch the value of a field that is available through wp-admin » Options:
- Name of the field figured out by looking up its field group at wp-admin » Custom fields » Field Groups:
webshop_country_code - This is a scalar. Not a repeater, array or object. Just a single value
See also
Sources
- https://www.advancedcustomfields.com/resources/
- https://www.advancedcustomfields.com/resources/#functions - All PHP functions together. It's not complete, though!
- https://www.advancedcustomfields.com/resources/code-examples/