diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index e8f1c935..f2cac814 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -773,7 +773,7 @@ class Net_SSH2 {
             require_once('Crypt/Hash.php');
         }
 
-        $this->last_packet = strtok(microtime(), ' ') + strtok(''); // == microtime(true) in PHP5
+        $this->last_packet = microtime(true);
         $this->message_numbers = array(
             1 => 'NET_SSH2_MSG_DISCONNECT',
             2 => 'NET_SSH2_MSG_IGNORE',
@@ -844,13 +844,13 @@ class Net_SSH2 {
                   61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE')
         );
 
-        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $start = microtime(true);
         $this->fsock = @fsockopen($host, $port, $errno, $errstr, $timeout);
         if (!$this->fsock) {
             user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
             return;
         }
-        $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
+        $elapsed = microtime(true) - $start;
 
         $timeout-= $elapsed;
 
@@ -2496,7 +2496,7 @@ class Net_SSH2 {
             return false;
         }
 
-        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $start = microtime(true);
         $raw = fread($this->fsock, $this->decrypt_block_size);
 
         if (!strlen($raw)) {
@@ -2529,7 +2529,7 @@ class Net_SSH2 {
             $buffer.= $temp;
             $remaining_length-= strlen($temp);
         }
-        $stop = strtok(microtime(), ' ') + strtok('');
+        $stop = microtime(true);
         if (strlen($buffer)) {
             $raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer;
         }
@@ -2552,7 +2552,7 @@ class Net_SSH2 {
         $this->get_seq_no++;
 
         if (defined('NET_SSH2_LOGGING')) {
-            $current = strtok(microtime(), ' ') + strtok('');
+            $current = microtime(true);
             $message_number = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')';
             $message_number = '<- ' . $message_number .
                               ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
@@ -2723,7 +2723,7 @@ class Net_SSH2 {
                 $read = array($this->fsock);
                 $write = $except = NULL;
 
-                $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+                $start = microtime(true);
                 $sec = floor($this->curTimeout);
                 $usec = 1000000 * ($this->curTimeout - $sec);
                 // on windows this returns a "Warning: Invalid CRT parameters detected" error
@@ -2731,7 +2731,7 @@ class Net_SSH2 {
                     $this->is_timeout = true;
                     return true;
                 }
-                $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
+                $elapsed = microtime(true) - $start;
                 $this->curTimeout-= $elapsed;
             }
 
@@ -2938,12 +2938,12 @@ class Net_SSH2 {
 
         $packet.= $hmac;
 
-        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $start = microtime(true);
         $result = strlen($packet) == fputs($this->fsock, $packet);
-        $stop = strtok(microtime(), ' ') + strtok('');
+        $stop = microtime(true);
 
         if (defined('NET_SSH2_LOGGING')) {
-            $current = strtok(microtime(), ' ') + strtok('');
+            $current = microtime(true);
             $message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')';
             $message_number = '-> ' . $message_number .
                               ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';