diff --git a/src/opnsense/service/templates/OPNsense/WebGui/php.ini b/src/opnsense/service/templates/OPNsense/WebGui/php.ini
index bd02f02eb..71bae2b75 100644
--- a/src/opnsense/service/templates/OPNsense/WebGui/php.ini
+++ b/src/opnsense/service/templates/OPNsense/WebGui/php.ini
@@ -20,8 +20,13 @@ zlib.output_compression = {% if system.webgui.compression|default('') != "" %}On
 zlib.output_compression_level = {{system.webgui.compression|default('1')}}
 include_path = "/usr/local/etc/inc:/usr/local/www:/usr/local/opnsense/mvc:/usr/local/opnsense/contrib:/usr/local/share/pear:/usr/local/share"
 ignore_repeated_errors = on
-error_reporting = E_ALL ^ (E_NOTICE | E_DEPRECATED | E_STRICT)
-display_errors=on
+{% if system.deployment|default("production") == "production" %}
+error_reporting = E_ALL ^ (E_WARNING | E_NOTICE | E_DEPRECATED | E_STRICT | E_CORE_WARNING | E_COMPILE_WARNING)
+{% else %}
+error_reporting = E_ALL
+{% endif %}
+display_errors={% if system.deployment|default("production") == "debug" %}on{%else%}off{%endif%}
+
 log_errors=on
 error_log=/tmp/PHP_errors.log
 date.timezone="{{system.timezone|default('Etc/UTC')}}"
diff --git a/src/www/system_advanced_admin.php b/src/www/system_advanced_admin.php
index 4fa4ca85a..dc986fc22 100644
--- a/src/www/system_advanced_admin.php
+++ b/src/www/system_advanced_admin.php
@@ -73,6 +73,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
     $pconfig['ssh-macs'] = !empty($config['system']['ssh']['macs']) ? explode(',', $config['system']['ssh']['macs']) : array();
     $pconfig['ssh-keys'] = !empty($config['system']['ssh']['keys']) ? explode(',', $config['system']['ssh']['keys']) : array();
     $pconfig['ssh-keysig'] = !empty($config['system']['ssh']['keysig']) ? explode(',', $config['system']['ssh']['keysig']) : array();
+    $pconfig['deployment'] = $config['system']['deployment'] ?? "production";
 
     /* XXX listtag "fun" */
     $pconfig['sshlogingroup'] = !empty($config['system']['ssh']['group'][0]) ? $config['system']['ssh']['group'][0] : null;
@@ -145,7 +146,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
             $config['system']['webgui']['interfaces'] != $newinterfaces ||
             (empty($pconfig['httpaccesslog'])) != empty($config['system']['webgui']['httpaccesslog']) ||
             (empty($pconfig['ssl-hsts'])) != empty($config['system']['webgui']['ssl-hsts']) ||
-            ($pconfig['disablehttpredirect'] == "yes") != !empty($config['system']['webgui']['disablehttpredirect']);
+            ($pconfig['disablehttpredirect'] == "yes") != !empty($config['system']['webgui']['disablehttpredirect']) ||
+            ($config['system']['deployment'] ?? null) != $pconfig['deployment'];
 
         $config['system']['webgui']['protocol'] = $pconfig['webguiproto'];
         $config['system']['webgui']['port'] = $pconfig['webguiport'];
@@ -153,6 +155,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
         $config['system']['webgui']['ssl-ciphers'] = $newciphers;
         $config['system']['webgui']['interfaces'] = $newinterfaces;
         $config['system']['webgui']['compression'] = $pconfig['compression'];
+        $config['system']['deployment'] = $pconfig['deployment'];
 
         if (!empty($pconfig['ssl-hsts'])) {
             $config['system']['webgui']['ssl-hsts'] = true;
@@ -1024,6 +1027,34 @@ $(document).ready(function() {
               </tr>
             </table>
           </div>
+          <div class="content-box tab-content table-responsive __mb">
+            <table class="table table-striped opnsense_standard_table_form">
+              <tr>
+                <td style="width:22%"><strong><?= gettext('Deployment') ?></strong></td>
+                <td style="width:78%"></td>
+              </tr>
+              <tr>
+                <td><a id="help_for_deployment" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Deployment type")?></td>
+                <td>
+                  <select name="deployment" class="selectpicker">
+                    <option value="production" <?=$pconfig['deployment'] == "production" ? 'selected="selected"' : '';?>>
+                      <?=gettext("Production");?>
+                    </option>
+                    <option value="development" <?=$pconfig['deployment'] == "development" ? 'selected="selected"' : '';?>>
+                      <?=gettext("Development");?>
+                    </option>
+                    <option value="debug" <?=$pconfig['deployment'] == "debug" ? 'selected="selected"' : '';?>>
+                      <?=gettext("Debug");?>
+                    </option>
+                  </select>
+                  <div class="hidden" data-for="help_for_deployment">
+                    <?=gettext("Set the deployment type of this OPNsense instance.");?></br>
+                    <?=gettext("Warning: enabling debug mode will affect the GUI's layout and may break usability.");?>
+                  </div>
+                </td>
+              </tr>
+            </table>
+          </div>
           <div class="content-box tab-content table-responsive">
             <table class="table table-striped opnsense_standard_table_form">
               <tr>