ical-drupal-calendar/includes/FileReader.php

<?php

namespace Pandy06269\iCalDrupal\includes;

class FileReader
{
    protected $handle;
    protected $path;

    public function __construct($filePath)
    {
        $this->path = substr($filePath, 0, 1) == DIRECTORY_SEPARATOR
            ? $filePath
            : sprintf('%s/%s', getcwd(), $filePath);
    }

    public function __destruct()
    {
        if (!is_null($this->handle))
        {
            @fclose($this->handle);
        }
    }

    public function getPath()
    {
        return $this->path;
    }

    public function read()
    {
        $this->open();
        $line = fgets($this->handle);

        if ($line !== false)
        {
            $line = rtrim($line);
        }

        return $line;
    }

    private function open()
    {
        global $php_errormsg;

        if (is_null($this->handle))
        {
            $this->handle = @fopen($this->path, 'r');
            if (!is_resource($this->handle))
            {
                throw new \Exception(sprintf('Error reading file "%s": %s', basename($this->path), $php_errormsg));
            }
        }
    }
}