<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter File Helpers
* CI文件助手
*
* @package CodeIgniter
* @subpackage Helpers
* @category Helpers
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/helpers/file_helpers.html
*/
// ------------------------------------------------------------------------
/**
* Read File
* 读取文件
*
* Opens the file specfied in the path and returns it as a string.
* 打开文件，而指定路径中，它作为一个字符串返回。
*
* @access public
* @param string path to file
* @return string
*/
if ( ! function_exists('read_file'))
{
function read_file($file)
{
//文件不存在
if ( ! file_exists($file))
{
return FALSE;
}
//查看是否支持file_get_contents();
if (function_exists('file_get_contents'))
{
return file_get_contents($file);
}
//如果文件打开失败
if ( ! $fp = @fopen($file, FOPEN_READ))
{
return FALSE;
}
//锁定文件
flock($fp, LOCK_SH);
$data = '';
//如果文件的大于0
if (filesize($file) > 0)
{
//开始读取，fread($fp,filesize($file));
//注意，这里返回的是一个引用
$data =& fread($fp, filesize($file));
}
//解锁定
flock($fp, LOCK_UN);
fclose($fp); //关闭文件流
return $data;
}
}
// ------------------------------------------------------------------------
/**
* Write File
* 写入文件
*
* Writes data to the file specified in the path.
* Creates a new file if non-existent.
* 将数据写入到指定的文件路径中。
* 创建一个新的文件，如果不存在。
* @access public
* @param string path to file
* @param string file data
* @return bool
*/
if ( ! function_exists('write_file'))
{
//$path: 路径
//$data: 内容
//$mode: FOPEN_WRITE_CREATE_DESTRUCSTIVE
// define('FOPEN_WRITE_CREATE_DESTRUCTIVE', 'wb');
function write_file($path, $data, $mode = FOPEN_WRITE_CREATE_DESTRUCTIVE)
{
//如果该路径打开失败
if ( ! $fp = @fopen($path, $mode))
{
return FALSE;
}
//锁定文件flock($fp,LOCK_EX)
flock($fp, LOCK_EX);
fwrite($fp, $data);
flock($fp, LOCK_UN); //解锁
fclose($fp); //关闭
return TRUE;
}
}
// ------------------------------------------------------------------------
/**
* Delete Files
* 删除文件
*
* Deletes all files contained in the supplied directory path.
* Files must be writable or owned by the system in order to be deleted.
* If the second parameter is set to TRUE, any directories contained
* within the supplied base directory will be nuked as well.
* 删除所提供的目录路径中包含的所有文件。
* 文件必须是可写的，或由系统拥有以被删除。
* 如果第二个参数设置为TRUE，任何目录中包含提供的基本目录内将被NUKE掉。
* @access public
* @param string path to file
* @param bool whether to delete any directories found in the path
* 是否要删除任何目录路径中找到
* @return bool
*/
if ( ! function_exists('delete_files'))
{
function delete_files($path, $del_dir = FALSE, $level = 0)
{
// Trim the trailing slash
// 剪裁尾随斜线
// rtrim($path)在$path中去掉系统的目录 链接符
$path = rtrim($path, DIRECTORY_SEPARATOR);
if ( ! $current_dir = @opendir($path))
{
return FALSE;
}
//开始读取文件
while (FALSE !== ($filename = @readdir($current_dir)))
{
//文件不为. 或者..
if ($filename != "." and $filename != "..")
{
//如果为目录
if (is_dir($path.DIRECTORY_SEPARATOR.$filename))
{
// Ignore empty folders 忽略空文件夹
if (substr($filename, 0, 1) != '.')
{
//将递归的及别加一
delete_files($path.DIRECTORY_SEPARATOR.$filename, $del_dir, $level + 1);
}
}
else
{
//删除文件
unlink($path.DIRECTORY_SEPARATOR.$filename);
}
}
}
@closedir($current_dir); //closedir($current_dir);
//如果要删除目录，并且递归的级别大小0
if ($del_dir == TRUE AND $level > 0)
{
return @rmdir($path); //删除目录
}
return TRUE;
}
}
// ------------------------------------------------------------------------
/**
* Get Filenames
* 获取文件名
*
* Reads the specified directory and builds an array containing the filenames.
* Any sub-folders contained within the specified path are read as well.
*
* 读取指定的目录和构建一个数组，包含文件名的。
* 任何指定的路径内包含的子文件夹都读。
* @access public
* @param string path to source 路径源
* @param bool whether to include the path as part of the filename
* 是否包括作为文件名的一部分的路径
* @param bool internal variable to determine recursion status - do not use in calls
* 内部变量来确定递归的状态 - 不使用通话
* @return array
*/
if ( ! function_exists('get_filenames'))
{
function get_filenames($source_dir, $include_path = FALSE, $_recursion = FALSE)
{
static $_filedata = array();
if ($fp = @opendir($source_dir))
{
// reset the array and make sure $source_dir has a trailing slash on the initial call
// 重置阵列和确保$ SOURCE_DIR有尾随斜线初始呼叫
if ($_recursion === FALSE)
{
$_filedata = array();
//realpath 返回垃规范的绝对路径名
//echo realpath('./../../etc/passwd');
//输出 /etc/passwd
// realpath()只有在文件目录存在的情况才返回规范后的绝对路径，如果不存在直接返回false
$source_dir = rtrim(realpath($source_dir), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
}
//开始读取文件
while (FALSE !== ($file = readdir($fp)))
{
//如果为目录 如果文件名为strncmp将$file与.进行对比
//strncmp()第三个参数是比较的长度
if (@is_dir($source_dir.$file) && strncmp($file, '.', 1) !== 0)
{
get_filenames($source_dir.$file.DIRECTORY_SEPARATOR, $include_path, TRUE);
}
elseif (strncmp($file, '.', 1) !== 0)
{
$_filedata[] = ($include_path == TRUE) ? $source_dir.$file : $file;
}
}
return $_filedata;
}
else
{
return FALSE;
}
}
}
// --------------------------------------------------------------------
/**
* Get Directory File Information
* 目录文件信息
*
* Reads the specified directory and builds an array containing the filenames,
* filesize, dates, and permissions
* 读取指定的目录中建立一个数组，包含文件名，
* 文件大小，日期和权限
*
* Any sub-folders contained within the specified path are read as well.
* 读取以及任何指定的路径内包含的子文件夹。
*
* @access public
* @param string path to source 目录路径
* @param bool Look only at the top level directory specified? 看看只在指定的顶级目录？
* @param bool internal variable to determine recursion status - do not use in calls
* 内部变量来确定递归的状态 - 不使用通话
* @return array
*/
if ( ! function_exists('get_dir_file_info'))
{
function get_dir_file_info($source_dir, $top_level_only = TRUE, $_recursion = FALSE)
{
static $_filedata = array(); //定义一个保存文件数据
$relative_path = $source_dir; //
//开打目录
if ($fp = @opendir($source_dir))
{
// reset the array and make sure $source_dir has a trailing slash on the initial call
// 重置阵列确保$ SOURCE_DIR有尾随斜线初始呼叫
if ($_recursion === FALSE)
{
$_filedata = array();
$source_dir = rtrim(realpath($source_dir), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
}
// foreach (scandir($source_dir, 1) as $file) // In addition to being PHP5+, scandir() is simply not as fast
while (FALSE !== ($file = readdir($fp)))
{
//如果为目录，进行递归
if (@is_dir($source_dir.$file) AND strncmp($file, '.', 1) !== 0 AND $top_level_only === FALSE)
{
get_dir_file_info($source_dir.$file.DIRECTORY_SEPARATOR, $top_level_only, TRUE);
}
//获取文件信息
elseif (strncmp($file, '.', 1) !== 0)
{
$_filedata[$file] = get_file_info($source_dir.$file);
$_filedata[$file]['relative_path'] = $relative_path;
}
}
return $_filedata;
}
else
{
return FALSE;
}
}
}
// --------------------------------------------------------------------
/**
* Get File Info
* 获取文件详细信息
*
* Given a file and path, returns the name, path, size, date modified
* Second parameter allows you to explicitly declare what information you want returned
* Options are: name, server_path, size, date, readable, writable, executable, fileperms
* Returns FALSE if the file cannot be found.
* 文件和路径，返回的名称，路径，大小，修改日期
* 第二个参数，可以明确地宣布你想要什么样的信息返回
* 选项是：名称，server_path，大小，日期，可读，可写，可执行，fileperms
* 返回FALSE如果无法找到该文件。
* @access public
* @param string path to file
* @param mixed array or comma separated string of information returned
* @return array
*/
if ( ! function_exists('get_file_info'))
{
function get_file_info($file, $returned_values = array('name', 'server_path', 'size', 'date'))
{
//$returned_values 数组为需要获取文件的那些属性
if ( ! file_exists($file))
{
return FALSE;
}
if (is_string($returned_values))
{
$returned_values = explode(',', $returned_values);
}
foreach ($returned_values as $key)
{
switch ($key)
{
case 'name': //如称
$fileinfo['name'] = substr(strrchr($file, DIRECTORY_SEPARATOR), 1);
break;
case 'server_path': //保存的路径
$fileinfo['server_path'] = $file;
break;
case 'size': //文件大小
$fileinfo['size'] = filesize($file);
break;
case 'date': //日期
$fileinfo['date'] = filemtime($file);
break;
case 'readable': //可读
$fileinfo['readable'] = is_readable($file);
break;
case 'writable': //
// There are known problems using is_weritable on IIS. It may not be reliable - consider fileperms()
// 一些已知问题用is_weritable在IIS。它可能是不可靠的 - 考虑fileperms（）
$fileinfo['writable'] = is_writable($file);
break;
case 'executable': //是否为可执行文件
$fileinfo['executable'] = is_executable($file);
break;
case 'fileperms': //文件的权限
$fileinfo['fileperms'] = fileperms($file);
break;
}
}
return $fileinfo;
}
}
// --------------------------------------------------------------------
/**
* Get Mime by Extension
* 获取MIME扩展
*
* Translates a file extension into a mime type based on config/mimes.php.
* Returns FALSE if it can't determine the type, or open the mime config file
* 翻译成的基础上config/ mimes.php中mime类型的文件扩展名。
* 返回FALSE，如果它不能确定类型，或者打开config文件的mime
*
* Note: this is NOT an accurate way of determining file mime types, and is here strictly as a convenience
* It should NOT be trusted, and should certainly NOT be used for security
* 注：这是不是一个准确的方法确定文件的MIME类型，是这里严格作为一种方便
* 它不应该被信任，当然不应该用于安全
*
* @access public
* @param string path to file
* @return mixed
*/
if ( ! function_exists('get_mime_by_extension'))
{
function get_mime_by_extension($file)
{
$extension = strtolower(substr(strrchr($file, '.'), 1));
global $mimes;
//加载 mimes文件
if ( ! is_array($mimes))
{
if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
{
include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
}
elseif (is_file(APPPATH.'config/mimes.php'))
{
include(APPPATH.'config/mimes.php');
}
if ( ! is_array($mimes))
{
return FALSE;
}
}
//判断该类型是否在mimes数组中
if (array_key_exists($extension, $mimes))
{
if (is_array($mimes[$extension]))
{
// Multiple mime types, just give the first one
// 多个MIME类型，只给第一个
return current($mimes[$extension]);
}
else
{
return $mimes[$extension];
}
}
else
{
return FALSE;
}
}
}
// --------------------------------------------------------------------
/**
* Symbolic Permissions
* 权限符号
*
* Takes a numeric value representing a file's permissions and returns
* standard symbolic notation representing that value
* 以一个数值代表一个文件的权限和回报
* 标准的符号，表示该值
* @access public
* @param int
* @return string
* 与一个十六进制进行与操作，然后对比一下，
*/
if ( ! function_exists('symbolic_permissions'))
{
function symbolic_permissions($perms)
{
if (($perms & 0xC000) == 0xC000)
{
$symbolic = 's'; // Socket
}
elseif (($perms & 0xA000) == 0xA000)
{
$symbolic = 'l'; // Symbolic Link
}
elseif (($perms & 0x8000) == 0x8000)
{
$symbolic = '-'; // Regular
}
elseif (($perms & 0x6000) == 0x6000)
{
$symbolic = 'b'; // Block special
}
elseif (($perms & 0x4000) == 0x4000)
{
$symbolic = 'd'; // Directory
}
elseif (($perms & 0x2000) == 0x2000)
{
$symbolic = 'c'; // Character special
}
elseif (($perms & 0x1000) == 0x1000)
{
$symbolic = 'p'; // FIFO pipe
}
else
{
$symbolic = 'u'; // Unknown
}
// Owner
$symbolic .= (($perms & 0x0100) ? 'r' : '-');
$symbolic .= (($perms & 0x0080) ? 'w' : '-');
$symbolic .= (($perms & 0x0040) ? (($perms & 0x0800) ? 's' : 'x' ) : (($perms & 0x0800) ? 'S' : '-'));
// Group
$symbolic .= (($perms & 0x0020) ? 'r' : '-');
$symbolic .= (($perms & 0x0010) ? 'w' : '-');
$symbolic .= (($perms & 0x0008) ? (($perms & 0x0400) ? 's' : 'x' ) : (($perms & 0x0400) ? 'S' : '-'));
// World
$symbolic .= (($perms & 0x0004) ? 'r' : '-');
$symbolic .= (($perms & 0x0002) ? 'w' : '-');
$symbolic .= (($perms & 0x0001) ? (($perms & 0x0200) ? 't' : 'x' ) : (($perms & 0x0200) ? 'T' : '-'));
return $symbolic;
}
}
// --------------------------------------------------------------------
/**
* Octal Permissions
* 八进制权限
* Takes a numeric value representing a file's permissions and returns
* a three character string representing the file's octal permissions
* 以一个数值代表一个文件的权限和回报
* 三个字符的字符串，代表文件的八进制权限
* @access public
* @param int
* @return string
*/
if ( ! function_exists('octal_permissions'))
{
function octal_permissions($perms)
{
return substr(sprintf('%o', $perms), -3);
}
}
/* End of file file_helper.php */
/* Location: ./system/helpers/file_helper.php */
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