Add stricter wrapper around unlink()

MD_STD.php

@@ -62,7 +62,7 @@ final class MD_STD {
      *
      * @return void
      */
-    public static function mkdir(string $pathname, int $mode = 0775, bool $recursive = false) {
+    public static function mkdir(string $pathname, int $mode = 0775, bool $recursive = false):void {
 
         if (\mkdir($pathname, $mode, $recursive) === false) {
             throw new Exception("Failed to create directory: $pathname");
@@ -70,6 +70,24 @@ final class MD_STD {
 
     }
 
+    /**
+     * Wrapper around unlink, that throws an exception if the file failed to be
+     * removed.
+     *
+     * @see https://www.php.net/manual/en/function.unlink.php
+     *
+     * @param string $filename File path.
+     *
+     * @return void
+     */
+    public static function unlink(string $filename):void {
+
+        if (\unlink($filename) === false) {
+            throw new Exception("Failed to delete: $filename");
+        }
+
+    }
+
     /**
      * Gets contents of a folder.
      *