⬆️ 🔨 Upgrade PHP Markdown library.

The current version throws deprecated warning with PHP7.1 and PHPUnit.
Upgrade the Markdown library to the current PHP Markdown Lib 1.7.0.
Used composer to manage this library.

vendor/composer/ClassLoader.php

@@ -55,6 +55,7 @@ class ClassLoader
     private $classMap = array();
     private $classMapAuthoritative = false;
     private $missingClasses = array();
+    private $apcuPrefix;
 
     public function getPrefixes()
     {
@@ -271,6 +272,26 @@ class ClassLoader
         return $this->classMapAuthoritative;
     }
 
+    /**
+     * APCu prefix to use to cache found/not-found classes, if the extension is enabled.
+     *
+     * @param string|null $apcuPrefix
+     */
+    public function setApcuPrefix($apcuPrefix)
+    {
+        $this->apcuPrefix = function_exists('apcu_fetch') && ini_get('apc.enabled') ? $apcuPrefix : null;
+    }
+
+    /**
+     * The APCu prefix in use, or null if APCu caching is not enabled.
+     *
+     * @return string|null
+     */
+    public function getApcuPrefix()
+    {
+        return $this->apcuPrefix;
+    }
+
     /**
      * Registers this instance as an autoloader.
      *
@@ -313,11 +334,6 @@ class ClassLoader
      */
     public function findFile($class)
     {
-        // work around for PHP 5.3.0 - 5.3.2 https://bugs.php.net/50731
-        if ('\\' == $class[0]) {
-            $class = substr($class, 1);
-        }
-
         // class map lookup
         if (isset($this->classMap[$class])) {
             return $this->classMap[$class];
@@ -325,6 +341,12 @@ class ClassLoader
         if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) {
             return false;
         }
+        if (null !== $this->apcuPrefix) {
+            $file = apcu_fetch($this->apcuPrefix.$class, $hit);
+            if ($hit) {
+                return $file;
+            }
+        }
 
         $file = $this->findFileWithExtension($class, '.php');
 
@@ -333,6 +355,10 @@ class ClassLoader
             $file = $this->findFileWithExtension($class, '.hh');
         }
 
+        if (null !== $this->apcuPrefix) {
+            apcu_add($this->apcuPrefix.$class, $file);
+        }
+
         if (false === $file) {
             // Remember that this class does not exist.
             $this->missingClasses[$class] = true;