Application

The Application class is a singleton that controls the Pair application from above. It is initialized in the index.php file and then then recalled anywhere in the application via:

// start the Application
$app = Application::getInstance();

Class constructor

Application is the first class loaded at startup and performs these preliminary operations:

1. Set PHP errors to E_ALL and force the display of errors;
2. Define the constants APPLICATION_PATH, PAIR_FOLDER, BASE_HREF and DEBUG;
3. Check for the config.php file and, if it is missing, start the installation wizard;
4. Load the config.php file to define the following constants:

• AUTH_SOURCE
• BASE_URI
• DBMS
• PRODUCT_NAME
• PRODUCT_VERSION
• UTC_DATE
• BASE_TIMEZONE

5. If defined DB_UTF8, set UTF8 flag for all communication with database;
6. Acquires the HTTP or HTTPS protocol;
7. Set up a custom error_handler that works on the web, for command line applications or for emulation of Unix daemon with PHP;
8. Set up gzip compression if available and not in debugging state;
9. Recovers messages for the user that have been queued since the previous session;