CI框架源码阅读,系统常量文件constants.php的配置

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 */