diff --git a/fn/common.php b/fn/common.php
index f3fd671..161c624 100644
--- a/fn/common.php
+++ b/fn/common.php
@@ -37,6 +37,35 @@ function processForm($requireLogin = true) {
 	return true;
 }
 
+function insert($table, $values) {
+	$query = 'INSERT INTO ' . $table . '(';
+
+	foreach ($values as $key => $val) {
+		if ($key === array_key_last($values))
+			$query .= "$key";
+		else
+			$query .= "$key, ";
+	}
+
+	$query .= ") VALUES(";
+	foreach ($values as $key => $val) {
+		if ($key === array_key_last($values))
+			$query .= ":$key";
+		else
+			$query .= ":$key, ";
+	}
+	$query .= ")";
+
+	$db = new PDO('sqlite:' . DB_PATH);
+
+	$op = $db->prepare($query);
+
+	foreach ($values as $key => $val)
+		$op->bindValue(":$key", $val);
+
+	$op->execute();
+}
+
 function query($action, $table, $conditions = [], $column = NULL) {
 
 	$query = match ($action) {
diff --git a/fn/ht.php b/fn/ht.php
index 08e3f1a..a7afaca 100644
--- a/fn/ht.php
+++ b/fn/ht.php
@@ -22,22 +22,15 @@ function listFsDirs($username) {
 }
 
 function addSite($username, $siteDir, $domain, $domainType, $protocol) {
-	$db = new PDO('sqlite:' . DB_PATH);
-
-	$op = $db->prepare("INSERT INTO sites(username, site_dir, domain, domain_type, protocol, creation_date, le_enabled) VALUES(:username, :site_dir, :domain, :domain_type, :protocol, :creation_date, :le_enabled)");
-
-	$op->bindValue(':username', $username);
-	$op->bindValue(':site_dir', $siteDir);
-	$op->bindValue(':domain', $domain);
-	$op->bindValue(':domain_type', $domainType);
-	$op->bindValue(':protocol', $protocol);
-	$op->bindValue(':creation_date', date("Y-m-d H:i:s"));
-	if ($domainType === "dns" AND $protocol === "http")
-		$op->bindValue(':le_enabled', 0);
-	else
-		$op->bindValue(':le_enabled', NULL);
-
-	$op->execute();
+	insert('sites', [
+		'username' => $username,
+		'site_dir' => $siteDir,
+		'domain' => $domain,
+		'domain_type' => $domainType,
+		'protocol' => $protocol,
+		'creation_date' => date("Y-m-d H:i:s"),
+		'le_enabled' => (($domainType === "dns" AND $protocol === "http") ? 0 : NULL),
+	]);
 }
 
 function dirsStatuses($username, $domainType, $protocol) {
diff --git a/pages/auth/register.php b/pages/auth/register.php
index dc0927b..936bfde 100644
--- a/pages/auth/register.php
+++ b/pages/auth/register.php
@@ -25,15 +25,11 @@ if (processForm(false)) {
 	if ($code !== 0)
 		serverError("Can't create Tor keys directory.");
 
-	$db = new PDO('sqlite:' . DB_PATH);
-
-	$stmt = $db->prepare("INSERT INTO users(username, password, registration_date) VALUES(:username, :password, :registration_date)");
-
-	$stmt->bindValue(':username', $_POST['username']);
-	$stmt->bindValue(':password', hashPassword($_POST['password']));
-	$stmt->bindValue(':registration_date', date("Y-m-d H:i:s"));
-
-	$stmt->execute();
+	insert('users', [
+		'username' => $_POST['username'],
+		'password' => hashPassword($_POST['password']),
+		'registration_date' => date("Y-m-d H:i:s"),
+	]);
 
 	$_SESSION['username'] = $_POST['username'];
 
diff --git a/pages/ns/zone-add.php b/pages/ns/zone-add.php
index 4561c21..a3bb6c8 100644
--- a/pages/ns/zone-add.php
+++ b/pages/ns/zone-add.php
@@ -14,13 +14,10 @@ if (processForm()) {
 	if (equalArrays(CONF['ns']['servers'], $matches[1]) !== true)
 		userError("Les serveurs ayant autorité dans cette zone indiqués par la zone parente ne sont pas ceux de Niver.");
 
-	$db = new PDO('sqlite:' . DB_PATH);
-	$stmt = $db->prepare("INSERT INTO zones(zone, username) VALUES(:zone, :username)");
-
-	$stmt->bindValue(':zone', $_POST['domain']);
-	$stmt->bindValue(':username', $_SESSION['username']);
-
-	$stmt->execute();
+	insert('zones', [
+		'zone' => $_POST['domain'],
+		'username' => $_SESSION['username'],
+	]);
 
 	$knotZonePath = CONF['ns']['knot_zones_path'] . "/" . $_POST['domain'] . "zone";
 	$knotZone = $_POST['domain'] . ' 3600 SOA ' . CONF['ns']['servers'][0] . ' admin.niver.test. 1 21600 7200 3628800 3600' . "\n";
diff --git a/pages/reg/register.php b/pages/reg/register.php
index 11e4594..8f807d6 100644
--- a/pages/reg/register.php
+++ b/pages/reg/register.php
@@ -12,14 +12,11 @@ if (processForm()) {
 	if (in_array($_POST['subdomain'], explode("\n", file_get_contents(CONF['common']['root_path'] . '/pages/reg/reserved.txt'))))
 		userError("Ce domaine n'est pas disponible à l'enregistrement. Il est réservé.");
 
-	$db = new PDO('sqlite:' . DB_PATH);
-	$stmt = $db->prepare("INSERT INTO registry(domain, username, last_renewal) VALUES(:domain, :username, :last_renewal)");
-
-	$stmt->bindValue(':domain', $domain);
-	$stmt->bindValue(':username', $_SESSION['username']);
-	$stmt->bindValue(':last_renewal', date("Y-m-d H:i:s"));
-
-	$stmt->execute();
+	insert('registry', [
+		'domain' => $domain,
+		'username' => $_SESSION['username'],
+		'last_renewal' => date("Y-m-d H:i:s"),
+	]);
 
 	success("Domaine ajouté au registre.");
 }