3 files changed, 6 insertions, 12 deletions
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 4c417cc03e..9cb5c215b3 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -1913,10 +1913,8 @@ function login_box($redirect = '', $l_explain = '', $l_success = '', $admin = fa
 				$confirm_id = md5(unique_id($user->ip));
 				$seed = hexdec(substr(unique_id(), 4, 10));
 
-				if ($seed > 0x7FFFFFFF)
-				{
-					$seed -= 0x7FFFFFFF;
-				}
+				// compute $seed % 0x7fffffff
+				$seed -= 0x7fffffff * floor($seed / 0x7fffffff);
 
 				$sql = 'INSERT INTO ' . CONFIRM_TABLE . ' ' . $db->sql_build_array('INSERT', array(
 					'confirm_id'	=> (string) $confirm_id,
diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index b4b28e8a1e..39afc8cad7 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -443,10 +443,8 @@ class ucp_register
 				$confirm_id = md5(unique_id($user->ip));
 				$seed = hexdec(substr(unique_id(), 4, 10));
 
-				if ($seed > 0x7FFFFFFF)
-				{
-					$seed -= 0x7FFFFFFF;
-				}
+				// compute $seed % 0x7fffffff
+				$seed -= 0x7fffffff * floor($seed / 0x7fffffff);
 
 				$sql = 'INSERT INTO ' . CONFIRM_TABLE . ' ' . $db->sql_build_array('INSERT', array(
 					'confirm_id'	=> (string) $confirm_id,
diff --git a/phpBB/posting.php b/phpBB/posting.php
index 9b33a9ab62..fbc91b47b9 100644
--- a/phpBB/posting.php
+++ b/phpBB/posting.php
@@ -1130,10 +1130,8 @@ if ($config['enable_post_confirm'] && !$user->data['is_registered'] && $solved_c
 	$confirm_id = md5(unique_id($user->ip));
 	$seed = hexdec(substr(unique_id(), 4, 10));
 
-	if ($seed > 0x7FFFFFFF)
-	{
-		$seed -= 0x7FFFFFFF;
-	}
+	// compute $seed % 0x7fffffff
+	$seed -= 0x7fffffff * floor($seed / 0x7fffffff);
 
 	$sql = 'INSERT INTO ' . CONFIRM_TABLE . ' ' . $db->sql_build_array('INSERT', array(
 		'confirm_id'	=> (string) $confirm_id,