CI框架源码阅读,系统常量文件constants.php的配置

发布时间：2013-04-01 13:34:18作者：知识屋

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 */