Hey there, let’s walk through the most common fixes and debugging steps for this exact scenario—hooks working locally but breaking on a customer’s server is super common, and usually boils down to cache, registration, or theme/template issues. Here’s what to check step by step:

1. Verify Hook Registration First #

The first thing to rule out is whether the displayWrapperTop hook is actually registered to your module on the server:

• Backoffice Check: Go to Modules > Modules, find your module, click "Configure", and scroll to the "Registered hooks" section. Ensure displayWrapperTop is listed here.
• Database Check: If the backoffice doesn’t show it, query the ps_hook_module table (replace ps_ with your database prefix) where name = 'displayWrapperTop' and id_module matches your module’s ID. If there’s no entry, re-install the module or add the entry manually via SQL to register the hook.

2. Confirm the Theme Renders the Hook #

PrestaShop hooks only fire if the active theme includes the hook call in its templates. Your local theme might have it, but the customer’s custom theme might not:

• Look for the hook call {hook h='displayWrapperTop'} in the customer’s theme files. For 1.7, this is typically in themes/[theme-name]/templates/_partials/header.tpl or themes/[theme-name]/templates/layouts/layout-both-columns.tpl (varies by theme structure).
• If the hook call is missing, add it to the appropriate template (get the customer’s permission first, or provide them with clear instructions).

3. Blow Away All Cache (Seriously, All of It) #

PrestaShop’s cache is notorious for causing "ghost" issues where changes don’t reflect on production. Do all of these:

• Clear backoffice cache: Go to Advanced Parameters > Performance > Clear cache (click all buttons here, including "Clear Smarty cache" and "Clear compiled templates").
• Manually delete files: SSH into the server and delete everything in var/cache/ (PrestaShop will rebuild this automatically).
• Check server-level caching: If the server uses Redis, APC, or a CDN (like Cloudflare), clear those caches too—they often hold old template or module data.

4. Enable Debug Mode to Catch Silent Errors #

Chances are there’s a PHP error failing silently on the server (local environments usually have error reporting turned on, but production doesn’t):

• Edit config/defines.inc.php and set define('_PS_MODE_DEV_', true);.
• Refresh the front page—if there’s a fatal error, syntax issue, or permission problem, it will now show up.
• Check server error logs: Even if debug mode doesn’t show it, look at Apache/NGINX error logs (usually in /var/log/apache2/ or /var/log/nginx/) for entries related to your module or the hook.

5. Test with a Minimal, Bare-Bones Hook Implementation #

Strip down your hook to the absolute minimum to isolate the issue. Replace your current hook code with this:

public function hookDisplayWrapperTop()
{
    // Test 1: Uncomment to see if the hook is even triggered
    // die('DisplayWrapperTop hook is running!');
    
    // Test 2: Return plain text to rule out template issues
    return '<div style="background: red; padding: 10px;">TEST FROM DISPLAYWRAPPERTOP</div>';
}

• If the die() statement stops the page, the hook is working, and the issue is with your template rendering or complex logic.
• If the red div doesn’t show up, the hook isn’t being called at all—go back to steps 1 and 2.

6. Check File Permissions #

When deploying, file permissions often get messed up. The web server user (usually www-data, apache, or nginx) needs read access to your module files:

• Set module folder permissions to 755 and file permissions to 644 (use SSH: chmod -R 755 modules/[your-module-name]/ and chmod -R 644 modules/[your-module-name]/*).
• Ensure the views/templates/hook folder and your .tpl file exist on the server and have the correct permissions.

7. Rule Out Module Conflicts #

Another module might be overriding or blocking the displayWrapperTop hook:

• Disable all other modules except yours, then check if the hook works.
• If it does, re-enable modules one by one until the hook breaks again—you’ll find the conflicting module.

8. Double-Check PrestaShop Version Exactness #

Even if both are 1.7, subversions (like 1.7.7.0 vs 1.7.8.10) can have hook location changes. Verify the customer’s PrestaShop version matches your local one, or check if displayWrapperTop was moved or renamed in their version.

If none of these steps work, share the exact minimal module code you’re using (including the hook registration part) and any error logs you find—we can dig deeper!

内容的提问来源于stack exchange，提问作者mricdev