The error_reporting() is a pre-defined function of PHP. error_reporting in PHP determines what kinds of errors and warnings PHP should report when running a script.

With the help of PHP program specify different levels of error reporting:

<?  
    // Turn off all error reporting  
    error_reporting(0);  
      
    // Report all PHP errors   
    error_reporting(E_ALL);  
  
    // Report all PHP errors  
    error_reporting(-1);  
      
    // Report all errors except E_NOTICE      
    error_reporting(E_ALL & ~E_NOTICE);  
      
    // Report simple running errors  
    error_reporting(E_WARNING | E_ERROR | E_PARSE);  
  
    // E_NOTICE is also good to report uninitialized variables  
    error_reporting( E_WARNING |E_ERROR | E_PARSE | E_NOTICE);  
  
    // It is same as error_reporting(E_ALL);  
    ini_set('error_reporting', E_LL);     
?>