lib/danog/PHP/StructTools.php
public function ExceptionErrorHandler($errno = 0, $errstr = null, $errfile = null, $errline = null)
    {
        // If error is suppressed with @, don't throw an exception
        if (error_reporting() === 0) {
            return true; // return true to continue through the others error handlers
        }

        throw new StructException($errstr.' on line '.$errline, $errno);
    }
public function ExceptionErrorHandler($errno = 0, $errstr = null, $errfile = null, $errline = null)
    {
        // If error is suppressed with @, don't throw an exception
        if (error_reporting() === 0) {
            return true; // return true to continue through the others error handlers
        }

        throw new StructException($errstr.' on line '.$errline, $errno);
    }
ExceptionErrorHandler.

Error handler for pack and unpack