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Configuring system constants
1. Check and configure these preferences when the file system is working
When the file system is running, these default values ​​will appropriately increase the security of the system, but at the bottom of PHP or Apache alone When opening a process for each user, it is always correct to use octal values ​​
FILE_READ_MODE The mode for reading files
FILE_WRITE_MODE The mode for writing files
DIR_READ_MODE The mode for reading directories
DIR_WRITE_MODE Write Directory mode


2. File stream mode
These modes are needed when we use fopen()/popen()
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');

File source code:

Copy code The code is as follows:

[php]

/*
|---------- -------------------------------------------------- ---------------
| File and Directory Modes
|--------------------- --------------------------------------------------

| These prefs are used when checking and setting modes when working
| with the file system. The defaults are fine 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('DIR_WRITE_MODE', 0777);

/*
|--------------------- --------------------------------------------------
| File Stream Modes File Stream Modes
|--------------------------------------------- -----------------------------------------------

| 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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