Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Utility/Timer.php

@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Utility\Timer.
+ */
+
+namespace Drupal\Component\Utility;
+
+/**
+ * Provides helpers to use timers throughout a request.
+ *
+ * @ingroup utility
+ */
+class Timer {
+
+  static protected $timers = array();
+
+  /**
+   * Starts the timer with the specified name.
+   *
+   * If you start and stop the same timer multiple times, the measured intervals
+   * will be accumulated.
+   *
+   * @param $name
+   *   The name of the timer.
+   */
+  static public function start($name) {
+    static::$timers[$name]['start'] = microtime(TRUE);
+    static::$timers[$name]['count'] = isset(static::$timers[$name]['count']) ? ++static::$timers[$name]['count'] : 1;
+  }
+
+  /**
+   * Reads the current timer value without stopping the timer.
+   *
+   * @param string $name
+   *   The name of the timer.
+   *
+   * @return int
+   *   The current timer value in ms.
+   */
+  static public function read($name) {
+    if (isset(static::$timers[$name]['start'])) {
+      $stop = microtime(TRUE);
+      $diff = round(($stop - static::$timers[$name]['start']) * 1000, 2);
+
+      if (isset(static::$timers[$name]['time'])) {
+        $diff += static::$timers[$name]['time'];
+      }
+      return $diff;
+    }
+    return static::$timers[$name]['time'];
+  }
+
+  /**
+   * Stops the timer with the specified name.
+   *
+   * @param string $name
+   *   The name of the timer.
+   *
+   * @return array
+   *   A timer array. The array contains the number of times the timer has been
+   *   started and stopped (count) and the accumulated timer value in ms (time).
+   */
+  static public function stop($name) {
+    if (isset(static::$timers[$name]['start'])) {
+      $stop = microtime(TRUE);
+      $diff = round(($stop - static::$timers[$name]['start']) * 1000, 2);
+      if (isset(static::$timers[$name]['time'])) {
+        static::$timers[$name]['time'] += $diff;
+      }
+      else {
+        static::$timers[$name]['time'] = $diff;
+      }
+      unset(static::$timers[$name]['start']);
+    }
+
+    return static::$timers[$name];
+  }
+
+}