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

Configure system constants

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]

/*

|------------------------------------------------- ----------------------------

| 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('FILE_WRITE_MODE', 0666);

define('DIR_READ_MODE', 0755);

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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