fgets() expects parameter 1 to be resource, null given

fgets() expects parameter 1 to be resource, null given

laravel 5.2

why is null file on fgets($this->file))? because it's first time i'm used laravel 5.2

fgets change with file_get_contents but it still didn't work

class FileDataSource implements IDataSource {

    protected $filename;
    protected $file;

    /**
     * Constructor
     *
     * @param string $filename
     * @return FileDataSource
     */
    public function __construct($filename) {
        $this->filename = $filename;
        $this->open();
        return $this;
    }

    /**
     * Destructor
     */
    public function __destruct() {
        $this->close();
    }

    /**
     * Opening file
     */
    public function open() {
        if (is_file($this->filename))
            $this->file = fopen($this->filename, 'r');
    }

    /**
     * Closing file
     */
    public function close() {
        fclose($this->file);
    }

    /**
     * Reading next document from file
     *
     * @return string | boolean
     */
    public function getNextDocument() {
        // if it's possible to read from file, remove new line character
        return (($line = fgets($this->file)) !== false)
            ? trim(preg_replace('/\s\s+/', ' ', $line))
            : false;
    }

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