Add class MD_STD_DEBUG for debugging and code improvements

src/MD_STD_DEBUG.php

@@ -0,0 +1,35 @@
+<?PHP
+/**
+ * Provides basic debugging functions.
+ */
+declare(strict_types = 1);
+
+/**
+ * Standard class providing simple and generally applicable
+ * debugging and code improvement functions.
+ */
+final class MD_STD_DEBUG {
+    /**
+     * Function simpleBenchmark prints the difference between start time and the time at the exit of script
+     * Should be put very early in the script.
+     *
+     * @return void
+     */
+    public static function simpleBenchmark():void {
+
+        $start = \microtime(true);
+        \register_shutdown_function(function($start) :void {
+            echo PHP_EOL . '<pre>';
+            echo  \microtime(true) - $start . "<br/>";
+            echo 'RAM Usage (Peak): ' . \memory_get_peak_usage() . "<br/>";
+            echo 'RAM Usage:        ' . \memory_get_usage() . "<br/>";
+            if ($loadAvg = \sys_getloadavg()) {
+                echo 'Load avg. (last  1 minute): ' . $loadAvg[0] . '<br />';
+                echo 'Load avg. (last  5 minute): ' . $loadAvg[1] . '<br />';
+                echo 'Load avg. (last 15 minute): ' . $loadAvg[2] . '<br />';
+            }
+            echo '</pre>';
+        }, $start);
+
+    }
+}