Changed a few strstr to strpos for consistency w performance guidelines and to mirror EE2.
diff --git a/system/core/Input.php b/system/core/Input.php
index 0760dc8..2eef824 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -288,7 +288,7 @@
 			return $this->ip_address;
 		}
 
-		if (strstr($this->ip_address, ','))
+		if (strpos($this->ip_address, ',') !== FALSE)
 		{
 			$x = explode(',', $this->ip_address);
 			$this->ip_address = trim(end($x));