diff --git a/auth/mnet/auth.php b/auth/mnet/auth.php
index e9950215705..ff28703e8d8 100644
--- a/auth/mnet/auth.php
+++ b/auth/mnet/auth.php
@@ -941,7 +941,6 @@ class auth_plugin_mnet extends auth_plugin_base {
         // run the keepalive client
         $this->keepalive_client();
 
-        // admin/cron.php should have run srand for us
         $random100 = rand(0,100);
         if ($random100 < 10) {     // Approximately 10% of the time.
             // nuke olden sessions
diff --git a/lib/adodb/adodb.inc.php b/lib/adodb/adodb.inc.php
index d0c2695f62e..11b5ef20d3a 100644
--- a/lib/adodb/adodb.inc.php
+++ b/lib/adodb/adodb.inc.php
@@ -169,11 +169,6 @@
 				die("Illegal path http:// or ftp://");
 		}
 		
-			
-		// Initialize random number generator for randomizing cache flushes
-		// -- note Since PHP 4.2.0, the seed  becomes optional and defaults to a random value if omitted.
-		 srand(((double)microtime())*1000000);
-		
 		/**
 		 * ADODB version as a string.
 		 */
diff --git a/lib/cronlib.php b/lib/cronlib.php
index 552398be4b7..8b5e40d978e 100644
--- a/lib/cronlib.php
+++ b/lib/cronlib.php
@@ -66,7 +66,6 @@ function cron_run() {
     // Run cleanup core cron jobs, but not every time since they aren't too important.
     // These don't have a timer to reduce load, so we'll use a random number
     // to randomly choose the percentage of times we should run these jobs.
-    srand ((double) microtime() * 10000000);
     $random100 = rand(0,100);
     if ($random100 < 20) {     // Approximately 20% of the time.
         mtrace("Running clean-up tasks...");
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 4179c7d8885..d677f26d2aa 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -7969,7 +7969,6 @@ function unformat_float($localefloat, $strict = false) {
  */
 function swapshuffle($array) {
 
-    srand ((double) microtime() * 10000000);
     $last = count($array) - 1;
     for ($i = 0; $i <= $last; $i++) {
         $from = rand(0, $last);
@@ -8009,7 +8008,6 @@ function swapshuffle_assoc($array) {
  * @return array
  */
 function draw_rand_array($array, $draws) {
-    srand ((double) microtime() * 10000000);
 
     $return = array();
 
diff --git a/lib/tests/accesslib_test.php b/lib/tests/accesslib_test.php
index b1cba20ede1..80df165c0b3 100644
--- a/lib/tests/accesslib_test.php
+++ b/lib/tests/accesslib_test.php
@@ -2274,8 +2274,6 @@ class core_accesslib_testcase extends advanced_testcase {
             $userids = array_slice($userids, 0, 5);
         }
 
-        // Random time!
-        // srand(666);
         foreach ($userids as $userid) { // No guest or deleted.
             // Each user gets 0-10 random roles.
             $rcount = rand(0, 10);