Question

How can I test if exit is clean in a shutdown function in PHP?

By clean exit I mean that the script was not terminated due to an error.

Answer 1

Its a good question, for the moment I only have this idea: register a shutdown function like this:

function shutdown() {
    if (defined('END_REACHED') {
        echo 'Script executed with no error', PHP_EOL;
    }
}

register_shutdown_function('shutdown');

With auto_append_file add an additional file to the very end of every script execution which sets an constant.

Your auto_append_file.php content:

define('END_REACHED', TRUE);

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In case you dont want to edit the php.ini you could do check error_get_last() or $php_errormsg in your register shutdown function!