php自定义错误

function  myErrorHandler ( $errno ,  $errstr ,  $errfile ,  $errline )
{
    if (!( error_reporting () &  $errno )) {
         return;
    }

    switch ( $errno ) {
    case  E_USER_ERROR :
        echo  "<b>My ERROR</b> [ $errno ]  $errstr <br />
" ;
        echo  "  Fatal error on line  $errline  in file  $errfile " ;
        echo  ", PHP "  .  PHP_VERSION  .  " ("  .  PHP_OS  .  ")<br />
" ;
        echo  "Aborting...<br />
" ;
        exit( 1 );
        break;

    case  E_USER_WARNING :
        echo  "<b>My WARNING</b> [ $errno ]  $errstr <br />
" ;
        break;

    case  E_USER_NOTICE :
        echo  "<b>My NOTICE</b> [ $errno ]  $errstr <br />
" ;
        break;

    default:
        echo  "Unknown error type: [ $errno ]  $errstr <br />
" ;
        break;
    }

     /* Don't execute PHP internal error handler */
     return  true ;
}

set_error_handler ( "myErrorHandler" );