add file system class for missing file/dir creation with writability exception

src/Utils/FileSystem/FileSystem.php

@@ -0,0 +1,45 @@
+<?php
+namespace Bsr\Utils\FileSystem;
+
+class FileSystem
+{
+    /**
+     * @param string $path full path
+     * @throws Exception if not writable
+     */
+    public static function createFileOrDirIfNotExists($path, $file=false, $throw=true)
+    {
+        if (file_exists($path)) {
+            return true;
+        }
+
+        $notExistsPart = false;
+        $parts = explode('/', $path);
+        $partsCount = count($parts);
+        $buildPath = '';
+        for ($i=0; $i<$partsCount; $i++) {
+            $part = $parts[$i];
+            if (!file_exists($buildPath . "/$part")) {
+                if (!is_writable($builPath)) {
+                    if ($throw) {
+                        throw new Exception("Attempting to create : $path, but $buildPath is not writeable.");
+                    }
+                    return false;
+                }
+                $notExistsPart = true;
+                break;
+            }
+            $buildPath .= "/$part";
+        }
+        
+        if ($file) {
+            $fileName = array_pop($parts);
+        }
+        $dirPath = implode('/', $parts);
+        mkdir($dirPath, 0777, true);
+        if ($file) {
+            touch("$dirPath/$fileName");
+        }
+        return true;
+    }
+}