CI framework source code interpretation of _fetch_uri_string() function usage analysis in URI.php, ciuristring_PHP tutorial

CI framework source code interpretation of _fetch_uri_string() function usage analysis in URI.php, ciuristring

The example of this article describes the usage of _fetch_uri_string() function in CI framework URI.php. Share it with everyone for your reference, the details are as follows:

The formulation of url format in APPPATH/config/config.php.

$config['uri_protocol'] = 'AUTO';

This configuration item defines which server global variables you use to formulate URLs.
The default setting is auto, which will poll the following four methods. When your link doesn't work, try using an option other than auto.

'AUTO' Default - auto detects
'PATH_INFO' Uses the PATH_INFO
'QUERY_STRING' Uses the QUERY_STRING
'REQUEST_URI' Uses the REQUEST_URI
'ORIG_PATH_INFO' Uses the ORIG_PATH_INFO

Several member variables in CI_URI

$keyval = array(); //List  of cached uri segments
$uri_string; //Current  uri string
$segments //List  of uri segments
$rsegments = array() //Re-indexed  list of uri segments

The obtained current uri string is assigned to $uri_string through function _set_uri_string($str).

There are several options to get $str, which is the business process part of _fetch_uri_string()

1. Default

$config['uri_protocol'] = 'AUTO'

, the program will poll the following methods once to obtain the URI

(1) When the program is run under CLI, that is, when the php file is under the command line. ci will get URI like this

private function _parse_cli_args()
{
  $args = array_slice($_SERVER['argv'], 1);
  return $args ? '/' .implode('/',$args) : '';
}

$_SERVER['argv'] contains the parameters passed to the script. When the script is run on the CLI, the command line parameters in c format will be given

Intercept all parameters in $_SERVER['argv'] except the first one

If you do this from the command line

php d:\wamp\www\CodeIgniter\index.php\start\index

_parse_cli_args() returns a string of /index.php/start/index

(2) By default, when REQUEST_URI is used to detect the url, the private function _detect_uri()

(3) If neither of the above two methods can obtain the uri, $_SERVER['PATH_INFO'] will be used to obtain it

$path = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO']  : @getenv('PATH_INFO');
if (trim($path, '/')  != '' && $path != "/".SELF)
{
  $this->_set_uri_string($path);
  return;
}

(4) If none of the above three methods can be obtained, then use

$_SERVER['QUERY_STRING'] or getenv['QUERY_STRING']

$path = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');
if (trim($path, '/') != '')
{
  $this->_set_uri_string($path);
  return;
}

(5) If the above four methods cannot obtain the URI, then you have to use the $_GET array, there is no other way

if (is_array($_GET) && count($_GET) == 1 && trim(key($_GET), '/') != '')
{
  $this->_set_uri_string(key($_GET));
  return;
}

2. Set in config.php:

$config['uri_protocol']

Then the program will automatically perform the corresponding operations to obtain the uri

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I hope this article will be helpful to everyone’s PHP program design based on the CodeIgniter framework.