src/Debug/FileStreamWrapper.php
public function stream_close()
    {
        if (!$this->handle) {
            return;
        }
        self::restorePrev();
        \fclose($this->handle);
        $this->handle = null;
        self::register();
    }
public function stream_close()
    {
        if (!$this->handle) {
            return;
        }
        self::restorePrev();
        \fclose($this->handle);
        $this->handle = null;
        self::register();
    }
Close a file

@see http://php.net/manual/en/streamwrapper.stream-close.php

@return void