acf auto increment field

1<?php
2function wfp_documents_setup_id_incr()
3{
4
5    // Check if user has rights to set it up and ACF is enabled.
6    if (current_user_can('administrator') && function_exists('get_field')):
7
8        // Initial value
9        // === YOU NEED TO UPDATE HERE ===
10        // Replace <code>custom_invoice_id</code> with your desired id name.
11        add_option('custom_invoice_id', '0001', '', 'yes');
12
13        /**
14         * Wrapper to get the id (if i would need to add something to it)
15         * @return mixed|void – stored next available id
16         */
17        function wfp_get_current_invoice_id()
18        {
19            return get_option('custom_invoice_id');
20        }
21
22        /**
23         * Count up the id by one and update the globally stored id
24         */
25        function wfp_increase_invoice_id()
26        {
27            $curr_invoice_id    = get_option('custom_invoice_id');
28            $next_invoice_id    = intval($curr_invoice_id) + 1;
29            update_option('custom_invoice_id', $next_invoice_id);
30        }
31
32        /**
33         * Populate the acf field when loading it.
34         */
35        function wfp_auto_get_current_document_id($value, $post_id, $field)
36        {
37            // If the custom field already has a value in it, just return this one (we don't want to overwrite it every single time)
38            if ($value !== null && $value !== "") {
39                return $value;
40            }
41
42            // If the field is empty, get the currently stored next available id and fill it in the field.
43            $value = wfp_get_current_invoice_id();
44            return $value;
45        }
46
47        // Use ACF hooks to populate the field on load
48        // ==== YOU NEED TO UPDATE HERE ====
49        // Replace <code>invoice_id</code> with the name of your field.
50        add_filter('acf/load_value/name=invoice_id', 'wfp_auto_get_current_document_id', 10, 3);
51
52        /**
53         * Registers function to check if the globally stored id needs to be updated after a post is saved.
54         */
55        function wfp_acf_save_post($post_id)
56        {
57            // Check if the post had any ACF to begin with.
58            if (!isset($_POST['acf'])) {
59                return;
60            }
61
62            $fields = $_POST['acf'];
63
64            // Only move to the next id when any ACF fields were added to that post, otherwise this might be an accident and would skip an id.
65            if ($_POST['_acf_changed'] == 0) {
66                return;
67            }
68
69            // Next we need to find the field out id is stored in
70            foreach ($fields as $field_key => $value) {
71                $field_object = get_field_object($field_key);
72
73                /**
74                 * If we found our field and the value of that field is the same as our currently "next available id" –
75                 * we need to increase this id, so the next post doesn't use the same id.
76                 */
77                if ($field_object['name'] == "invoice_id"
78                    && wfp_get_current_invoice_id() == $value) {
79                    wfp_increase_invoice_id();
80
81                    return;
82                }
83            }
84        }
85
86        // Use a hook to run this function every time a post is saved.
87        add_action('acf/save_post', 'wfp_acf_save_post', 20);
88
89        /**
90         * The code below just displays the currently stored next id on an acf-options-page,
91         * so it's easy to see which id you're on. The field is disabled to prevent easy tinkering with the id.
92         */
93        function wfp_load_current_document_ids_settingspage($value, $postid, $field)
94        {
95            if ($field['name'] == "document_ids-group_current_invoice_id") {
96                return wfp_get_current_invoice_id();
97            }
98            return $value;
99        }
100
101        function wfp_disable_acf_field($field)
102        {
103            $field['disabled'] = 1;
104
105            return $field;
106        }
107
108        add_filter('acf/load_field/name=current_invoice_id', 'wfp_disable_acf_field', 10, 3);
109        add_filter('acf/load_value/name=current_invoice_id', 'wfp_load_current_document_ids_settingspage', 10, 3);
110
111    endif;
112}
113
114add_action('init', 'wfp_documents_setup_id_incr');
115?>