public function chmod($permissions)
    {
        $this->permissions           = $permissions;
        $this->lastAttributeModified = time();
        clearstatcache();
        return $this;
    }
public function chmod($permissions)
    {
        $this->permissions           = $permissions;
        $this->lastAttributeModified = time();
        clearstatcache();
        return $this;
    }
public function chmod ( $ permissions ) { $ this -> permissions = $ permissions ; $ this -> lastAttributeModified = time ( ) ; clearstatcache ( ) ; return $ this ; }
change file runtimeEnvironment to given permissions

@param   int               $permissions
@return  vfsStreamContent
change file runtimeEnvironment to given permissions