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php 检查文件或目录是否存在代码总结

Jun 08, 2016 pm 05:24 PM
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检查文件或目录是否存在 ,我们使用了php中常用的函数file_exists,这个函数就可以实现我想要的功能,下面大家慢慢参考一下。

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下面是一个简单的检查文件是否存在的实例代码:

 代码如下 复制代码

$filename = '/path/to/foo.txt';

if (file_exists($filename)) {
    echo "The file $filename exists";
} else {
    echo "The file $filename does not exist";
}
?>

如果文件存在,执行该 PHP 文件的显示结果是:

The file C:blablaphphello.txt exists.

如果文件不存在,执行该 PHP 文件的显示结果是:

The file C:blablaphphello.txt does not exist.

你也可以用file_exists 函数测试某个目录是否存在,示例代码如下:

 代码如下 复制代码

if (file_exists("C:\blabla\php"))
  {echo "yes";}
else
  {echo "no";}


实例

 代码如下 复制代码

/**
 * 文件或目录权限检查函数
 *
 * @access          public
 * @param           string  $file_path   文件路径
 * @param           bool    $rename_prv  是否在检查修改权限时检查执行rename()函数的权限
 *
 * @return          int     返回值的取值范围为{0  *                          返回值在二进制计数法中,四位由高到低分别代表
 *                          可执行rename()函数权限、可对文件追加内容权限、可写入文件权限、可读取文件权限。
 */
function file_mode_info($file_path)
{
    /* 如果不存在,则不可读、不可写、不可改 */
    if (!file_exists($file_path))
    {
        return false;
    }
    $mark = 0;
    if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN')
    {
        /* 测试文件 */
        $test_file = $file_path . '/cf_test.txt';
        /* 如果是目录 */
        if (is_dir($file_path))
        {
            /* 检查目录是否可读 */
            $dir = @opendir($file_path);
            if ($dir === false)
            {
                return $mark; //如果目录打开失败,直接返回目录不可修改、不可写、不可读
            }
            if (@readdir($dir) !== false)
            {
                $mark ^= 1; //目录可读 001,目录不可读 000
            }
            @closedir($dir);
            /* 检查目录是否可写 */
            $fp = @fopen($test_file, 'wb');
            if ($fp === false)
            {
                return $mark; //如果目录中的文件创建失败,返回不可写。
            }
            if (@fwrite($fp, 'directory access testing.') !== false)
            {
                $mark ^= 2; //目录可写可读011,目录可写不可读 010
            }
            @fclose($fp);
            @unlink($test_file);
            /* 检查目录是否可修改 */
            $fp = @fopen($test_file, 'ab+');
            if ($fp === false)
            {
                return $mark;
            }
            if (@fwrite($fp, "modify test.rn") !== false)
            {
                $mark ^= 4;
            }
            @fclose($fp);
            /* 检查目录下是否有执行rename()函数的权限 */
            if (@rename($test_file, $test_file) !== false)
            {
                $mark ^= 8;
            }
            @unlink($test_file);
        }
        /* 如果是文件 */
        elseif (is_file($file_path))
        {
            /* 以读方式打开 */
            $fp = @fopen($file_path, 'rb');
            if ($fp)
            {
                $mark ^= 1; //可读 001
            }
            @fclose($fp);
            /* 试着修改文件 */
            $fp = @fopen($file_path, 'ab+');
            if ($fp && @fwrite($fp, '') !== false)
            {
                $mark ^= 6; //可修改可写可读 111,不可修改可写可读011...
            }
            @fclose($fp);
            /* 检查目录下是否有执行rename()函数的权限 */
            if (@rename($test_file, $test_file) !== false)
            {
                $mark ^= 8;
            }
        }
    }
    else
    {
        if (@is_readable($file_path))
        {
            $mark ^= 1;
        }
        if (@is_writable($file_path))
        {
            $mark ^= 14;
        }
    }
    return $mark;
}


 

PHP判断目录是否存在    

 代码如下 复制代码

/****************************************************
     * 将xml数据流,写入到xml文件
     * @param $xmlData
     * @return bool|string
     */
    function writeXmlFile($xmlData)
    {
        $time = time(); //获取时间戳,用于给文件命名
        $path = dirname(__FILE__); //获取当前绝对路径
        $path = substr_replace($path, "", stripos($path, "actions\data")); //将此文件所在的固有路径替换成空
        $path .= "xmlFiles\"; //存放目录名

        /*判断目标目录是否存在,不存在则新建*/
        if(!is_dir($path))
        {
            mkdir($path); //新建目录
        }

        /*记录完整路径和文件名*/
        $filePathAndName = $path.$time.".xml";

        /*打开文件,文件名为 + <.xml>*/
        $fp = fopen($filePathAndName, "w");
        if(!$fp)
        {
            return false;
        }

        /*写入文件流*/
        $flag = fwrite($fp, $xmlData);
        if(!$flag)
        {
            return false;
        }

        fclose($fp);

        return $filePathAndName;
    }

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