---
title: For developers
description: "cPOD Kit is modular: each module lives in `modules//`, with a `module.php` that declares its name, dependencies, conflicting plugins and the data to remove on uninstall. Code uses the `CPODKit\\` namespace and the `cpod_` prefix for options, meta, hooks and…"
url: "https://cpodkit.com/docs/for-developers/"
updated: "2026-10-22"
category: Reference
---

# For developers

cPOD Kit is modular: each module lives in `modules/<id>/`, with a `module.php` that declares its name, dependencies, conflicting plugins and the data to remove on uninstall. Code uses the `CPODKit\` namespace and the `cpod_` prefix for options, meta, hooks and shortcodes.

### Functions

| Function | Returns |
| --- | --- |
| `cpod_module_active( 'pod-profile' )` | Whether a module is running |
| `cpod_store_email()` | Store email (Store Variables, else the site admin email) |
| `cpod_replace_placeholders( $html, $product_id = 0 )` | Text with `{{…}}` placeholders replaced |
| `cpod_sc_get_product_charts( $product_id )` | Size charts that apply to a product |
| `cpod_sc_render_chart( $chart_id )` | HTML of a size chart |
| `cpod_sc_render_button( $chart_id, $label = '' )` | HTML of a size guide button |
| `cpod_sc_get_charts()` | All size charts |

Check `function_exists()` first, since a module that is off does not load its functions.

### Actions

- `cpod_loaded`: after all active modules have loaded.
- `cpod_sc_loaded`, `cpod_pp_loaded`: after Size Chart / POD Profile have loaded.

### Add a placeholder

```
add_filter( 'cpod_placeholders', function ( $list ) {
    $list['warehouse'] = array( 'label' => 'Warehouse city', 'dynamic' => false );
    return $list;
} );
add_filter( 'cpod_placeholder_values', function ( $values, $product_id, $country ) {
    $values['warehouse'] = 'US' === $country ? 'Dallas' : 'Rotterdam';
    return $values;
}, 10, 3 );
```

### Filters

- **Size Chart:** `cpod_sc_charts_for_product`, `cpod_sc_chart_html`, `cpod_sc_button_hook`, `cpod_sc_popup_engine`, `cpod_sc_show_tab`, `cpod_sc_tab_priority`, `cpod_sc_presets`.
- **POD Profile and Estimated Delivery:** `cpod_pp_profile_for_product`, `cpod_pp_shipping_profile_match`, `cpod_pp_estimate`, `cpod_pp_dynamic_values`, `cpod_pp_detail_rows`, `cpod_pp_details_html`, `cpod_pp_estimate_html`, `cpod_pp_est_hook`, `cpod_pp_product_tabs`.
- **Product Sections and Hook Blocks:** `cpod_pp_shipping_html`, `cpod_pp_returns_html`, `cpod_ps_set_for_product`, `cpod_hook_block_html`, `cpod_hook_block_matches`.
- **Store Variables:** `cpod_store_email`.
- **Icons:** `cpod_icons`.
- **Admin and front end:** `cpod_admin_sections`, `cpod_settings_tabs`, `cpod_ajax_data`, `cpod_frontend_css_vars`.

### CSS and data

- CSS classes start with `.cpod-` and CSS variables with `--cpod-`.
- Post types: `cpod_size_chart`, `cpod_product_profile`, `cpod_ship_profile`.
- Settings are stored in options starting with `cpod_`, product settings in post meta starting with `_cpod_`.