CI framework source code reading---------system constant file constants.php_PHP tutorial

1. Check and configure these preferences when the file system is working

These default values ​​will appropriately increase the security of the system when the file system is running, but when the bottom layer of php or apache opens a separate process for each user, it is always correct to use octal values

FILE_READ_MODE mode for reading files

FILE_WRITE_MODE mode for writing files

DIR_READ_MODE Mode for reading directories

DIR_WRITE_MODE mode for writing directories

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:

[php]

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 */