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This issue occurs when you upgrade your existing CodeIgniter application version to CodeIgniter 3.x. The undefined constant viewpath issue can be easily solved by the following solution.
Open the root’s index.php file and specify the view directory to solve CodeIgniter 3 use of undefined constant viewpath issue.
Place the following code after APPLICATION DIRECTORY NAME.
/*
*---------------------------------------------------------------
* VIEW DIRECTORY NAME
*---------------------------------------------------------------
*
* If you want to move the view directory out of the application
* directory, set the path to it here. The directory can be renamed
* and relocated anywhere on your server. If blank, it will default
* to the standard location inside your application directory.
* If you do move this, use an absolute (full) server path.
*
* NO TRAILING SLASH!
*/
$view_folder = '';
Place the following code after The path to the “application” directory.
// The path to the "views" directory
if ( ! isset($view_folder[0]) && is_dir(APPPATH.'views'.DIRECTORY_SEPARATOR))
{
$view_folder = APPPATH.'views';
}
elseif (is_dir($view_folder))
{
if (($_temp = realpath($view_folder)) !== FALSE)
{
$view_folder = $_temp;
}
else
{
$view_folder = strtr(
rtrim($view_folder, '/\\'),
'/\\',
DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
);
}
}
elseif (is_dir(APPPATH.$view_folder.DIRECTORY_SEPARATOR))
{
$view_folder = APPPATH.strtr(
trim($view_folder, '/\\'),
'/\\',
DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
);
}
else
{
header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
echo 'Your view folder path does not appear to be set correctly. Please open the following file and correct this: '.SELF;
exit(3); // EXIT_CONFIG
}
define('VIEWPATH', $view_folder.DIRECTORY_SEPARATOR);
