diff --git a/readme.md b/readme.md
index df55847..4f1ea1a 100644
--- a/readme.md
+++ b/readme.md
@@ -3,7 +3,7 @@ Debug tools like: varExport* functions, timer, server dump, SQL Beautifier, etc.
 
 ## Prerequisite
 
-* PHP 4 (v1.0), PHP 5.4+ (v1.1+) ou PHP 7 & 7.4 (v2)
+* PHP 4 (v1.0), PHP 5.4+ (v1.1), PHP 5.6 (v1.2+) or PHP 7.4 (v2)
 
 ## Install
 Edit your [composer.json](https://getcomposer.org) (launch `composer update` after edit):
@@ -12,7 +12,7 @@ Edit your [composer.json](https://getcomposer.org) (launch `composer update` aft
   "repositories": [
     { "type": "git", "url": "git@github.com:jgauthi/component_debug.git" }
   ],
-  "require": {
+  "require-dev": {
     "jgauthi/component_debug": "1.*"
   }
 }
diff --git a/src/timer.class.php b/src/timer.class.php
new file mode 100644
index 0000000..43f7e65
--- /dev/null
+++ b/src/timer.class.php
@@ -0,0 +1,127 @@
+<?php
+/**
+ * Timer - Stopwatch in milliseconds script time
+    + the various steps in the code
+ * @author: Jgauthi <github.com/jgauthi>
+ * @maj 14/03/09
+ * @version 1.0
+ */
+
+class timer
+{
+    var $debut;
+    var $fin;
+    var $time = array();
+    var $start = false;
+    var $header = 0;
+    var $resultat;
+    var $etape;
+
+    //-- CONSTRUCTEUR ---------------------------------
+    FUNCTION timer($header = 0)
+    {
+        $this -> debut = microtime();
+        $this -> header = $header;
+    }
+
+    //-- ETALONNER LE PARCOURS DU SCRIPT --------------
+    FUNCTION etape($nom)
+    {
+        $this -> time[] = array('nom' => $nom, 'time' => microtime());
+    }
+
+    //-- METTRE FIN AU COMPTEUR
+    FUNCTION stop()
+    {
+        $this -> fin = microtime();
+
+        // Conversion
+        $this -> debut = $this -> _unit($this -> debut);
+        $this -> fin = $this -> _unit($this -> fin);
+
+        // Vérifie si le header est correcte
+        if ($this -> header && headers_sent()) $this -> header = false;
+
+        // Analyse des données
+        $this -> resultat =  $this -> _conv($this -> fin - $this -> debut);
+
+        // Analyse des étapes
+        if (count($this -> time) > 0)
+        {
+            $etape = '';
+            foreach($this -> time as $id => $tmp)
+            {
+                $temp = $this -> _vir($this -> _conv($this -> _unit($tmp['time']) - $this -> debut));
+                $this -> etape .= '- '.$tmp['nom'].': '.$temp." ms\n";
+                if ($this -> header)
+                    header($id.'-Time: '.$temp.' ms -> '.$tmp['nom']);
+            }
+        }
+
+        // Renvoi des données
+        if ($this -> header)	header('X-Time: '.$this -> _vir($this -> resultat).' ms');
+    }
+
+    //--
+    FUNCTION OutPut($type = 'commentaire')
+    {
+        if ($type == 'commentaire')
+        {
+            $av = '<!- TEMPS ECOULE DU SCRIPT: ';
+            $ap = '-->';
+        }
+        else
+        {
+            $av = '<h2>Temps écoulé du script: </h2>';
+            $ap = '';
+        }
+
+        if (count($this -> time) == 0)
+            return ("\n\n".$av.'Time: '.$this -> _vir($this -> resultat).' ms'.$ap);
+        else
+            return "\n\n".$av.
+                (($type != 'commentaire') ?
+                    str_replace("\n","<br />\n", $this -> etape):
+                    $this -> etape).
+                $ap."\n". '=> Time: '.$this -> _vir($this -> resultat)." ms\n\n";
+    }
+
+    FUNCTION temps ()
+    {
+        return $this -> _vir($this -> resultat);
+    }
+
+    FUNCTION end($format = 'html')
+    {
+        $this->stop();
+        echo $this->OutPut($format);
+    }
+
+    FUNCTION shutdown()
+    {
+        register_shutdown_function(array($this, 'end'));
+    }
+
+    //-- CONVERTISSEUR ---------------------------------
+    FUNCTION _unit($time)
+    {
+        list($usec,$sec) = explode(' ',$time);
+        return $usec + $sec;
+    }
+
+    FUNCTION _conv($time)
+    {
+        return substr($time*1000, 0, 6);
+
+        // Récupérer les 6 premiers chiffres
+        // Convertie en millisecondes
+        // Remplace . par , ( écriture FR)
+    }
+
+    FUNCTION _vir($chiffre)
+    {
+        return str_replace('.', ',', $chiffre);
+    }
+}
+
+?>
\ No newline at end of file