framework/RedKiteCms/Content/BlockManager/BlockManager.php
protected function saveSlotDefinition($dir, array $slot)
    {
        $slotsFilename = $this->getSlotDefinitionFile($dir);

        FilesystemTools::writeFile($slotsFilename, json_encode($slot), $this->filesystem);
    }
protected function saveSlotDefinition($dir, array $slot)
    {
        $slotsFilename = $this->getSlotDefinitionFile($dir);

        FilesystemTools::writeFile($slotsFilename, json_encode($slot), $this->filesystem);
    }
Saves the slot definition

@param string $dir
@param array $slot