<?php

class FileException extends Exception
{
    public function getDetails()
    {
        switch ($this->code) {
            case 0:
                return "没有提供文件";
                break;
            case 1:
                return "文件不存在";
                break;
            case 2:
                return "不是一个文件";
                break;
            case 3:
                return "文件不可写";
                break;
            case 4:
                return "非法文件的操作模式";
                break;
            case 5:
                return '数据写入失败';
                break;
            case 6:
                return '文件不能被关闭';
                break;
            default:
                return "非法";
                break;
        }
    }
}

class WriteData
{
    private $_message = '';
    private $_fp;

    public function __construct($filename = null, $mode = 'w')
    {
        $this->_message = "文件:{$filename} 模式:{$mode}";
        if (empty($filename)) throw new FileException($this->_message, 0);
        if (!file_exists($filename)) throw new FileException($this->_message, 1);
        if (!is_file($filename)) throw new FileException($this->_message, 2);
        if (!is_writable($filename)) throw new FileException($this->_message, 3);
        if (!in_array($mode, array('w', 'w+', 'a', 'a++'))) throw new FileException($this->_message, 4);
        $this->_fp = fopen($filename, $mode);
    }

    public function write($data)
    {
        if (@!fwrite($this->_fp, $data . PHP_EOL)) throw new FileException($this->_message . " 数据写入失败", 5);
    }

    public function close()
    {
        if ($this->_fp) {
            if (@!fclose($this->_fp)) throw new FileException($this->_message, 6);
            $this->_fp = null;
        }
    }

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

try {
    //$fp = new WriteData('test.txt', 'w');//出现问题了 文件:test.txt 模式:w详细信息如下: 文件不存在
    //$fp = new WriteData();//出现问题了 文件: 模式:w详细信息如下: 没有提供文件
    $fp = new WriteData('test2.txt', 'w');
    $fp->write('this is a test');
    $fp->close();
    echo "数据写入成功<hr/>";

} catch (FileException $e) {
    echo "出现问题了 " . $e->getMessage() . "详细信息如下:  " . $e->getDetails();
}

?>

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