CI框架源码阅读,系统常量文件constants.php的配置

时间：2018-12-30分类：PHP作者：编程之家AI导航网

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：
<div class="codetitle"><a style="CURSOR: pointer" data="96599" class="copybut" id="copybut96599" onclick="doCopy('code96599')"> 代码如下:

<div class="codebody" id="code96599">
[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 /

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