errorLevel php no warnings

/* Display all errors like dev */
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

/* Display PROD errors */
ini_set('display_errors', 1);
ini_set('display_startup_errors', 0);
error_reporting(E_ALL & ~E_NOTICE);

/* OTHER SETTINGS*/

// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// Reporting E_NOTICE 
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);

// Report all errors except E_NOTICE
error_reporting(E_ALL & ~E_NOTICE);
// For PHP < 5.3
error_reporting(E_ALL ^ E_NOTICE);

// Report all PHP errors
error_reporting(E_ALL);
//or
error_reporting(-1);
//or
error_reporting(0);