fix function tap

src/helpers.php

@@ -43,3 +43,19 @@ function value($value)
         return $value instanceof Closure ? $value() : $value;
     }
 }
+
+if (! function_exists('tap')) {
+    /**
+     * Call the given Closure with the given value then return the value.
+     *
+     * @param  mixed  $value
+     * @param  callable  $callback
+     * @return mixed
+     */
+    function tap($value, $callback)
+    {
+        $callback($value);
+
+        return $value;
+    }
+}