CI框架源码阅读,系统常量文件constants.php的配置
author:一佰互联 2019-04-30   click:200
配置系统常量
1、当文件系统工作的时候检查并配置这些首选项
文件系统运行的时候这些默认的值会适当的增加系统的安全性,但是在php或apache的底层单独的为每各用户开一个进程的时候,使用八进制的值永远是正确的
FILE_READ_MODE 读取文件的模式
FILE_WRITE_MODE   写入文件的模式
DIR_READ_MODE   读取目录的模式
DIR_WRITE_MODE 写入目录的模式 
2、文件流模式
当我们使用fopen()/popen()的时候需要这些模式
define("FOPEN_READ", "rb");
define("FOPEN_READ_WRITE", "r+b");
define("FOPEN_WRITE_CREATE_DESTRUCTIVE", "wb");
define("FOPEN_READ_WRITE_CREATE_DESTRUCTIVE",  "w+b");
define("FOPEN_WRITE_CREATE", "ab");
define("FOPEN_READ_WRITE_CREATE", "a+b");
define("FOPEN_WRITE_CREATE_STRICT", "xb");
define("FOPEN_READ_WRITE_CREATE_STRICT",  "x+b");文件源码:
复制代码 代码如下:
[php] 
<?php  if ( ! defined("BASEPATH")) exit("No direct script access allowed");  /*
|--------------------------------------------------------------------------
| File and Directory Modes
|-------------------------------------------------------------------------- | These prefs 控制台、首选项 are used when checking and setting modes when working
| with the file system.  The defaults are fine 罚款 on servers with proper
| security, but you may wish (or even need) to change the values in
| certain environments (Apache running a separate process for each
| user, PHP under CGI with Apache suEXEC, etc.).  Octal values should
| always be used to set the mode correctly. */ 
define("FILE_READ_MODE", 0644); 
define("FILE_WRITE_MODE", 0666); 
define("DIR_READ_MODE", 0755); 
define("DIR_WRITE_MODE", 0777);  /*
|--------------------------------------------------------------------------
| File Stream Modes 文件流模式
|-------------------------------------------------------------------------- | These modes are used when working with fopen()/popen() */  define("FOPEN_READ",                            "rb"); 
define("FOPEN_READ_WRITE",                      "r+b"); 
define("FOPEN_WRITE_CREATE_DESTRUCTIVE",        "wb"); // truncates existing file data, use with care 
define("FOPEN_READ_WRITE_CREATE_DESTRUCTIVE",   "w+b"); // truncates existing file data, use with care 
define("FOPEN_WRITE_CREATE",                    "ab"); 
define("FOPEN_READ_WRITE_CREATE",               "a+b"); 
define("FOPEN_WRITE_CREATE_STRICT",             "xb"); 
define("FOPEN_READ_WRITE_CREATE_STRICT",        "x+b");   
/* End of file constants.php */ 
/* Location: ./application/config/constants.php */