Allow passing a callback to "with"

src/Illuminate/Support/helpers.php

@@ -1154,13 +1154,14 @@ function windows_os()
 
 if (! function_exists('with')) {
     /**
-     * Return the given object. Useful for chaining.
+     * Return the given value, optionaly passed through the given callback.
      *
-     * @param  mixed  $object
+     * @param  mixed  $value
+     * @param  callable|null  $callback
      * @return mixed
      */
-    function with($object)
+    function with($value, callable $callback = null)
     {
-        return $object;
+        return is_null($callback) ? $value : $callback($value);
     }
 }

tests/Support/SupportHelpersTest.php

@@ -804,6 +804,15 @@ public function testTransform()
             return 10;
         }));
     }
+
+    public function testWith()
+    {
+        $this->assertEquals(10, with(10));
+
+        $this->assertEquals(10, with(5, function ($five) {
+            return $five + 5;
+        }));
+    }
 }
 
 trait SupportTestTraitOne