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Cannot capture FATAL level error with set_error_handler()

2019-11-19 01:52:19

label: PHP, set_error_handler, Fatal Errors, register_shutdown_function, error_get_last,

Using set_error_handler() in PHP to implement custom error handling functions is a very useful technique. However, set_error_handler() does not catch fatal errors.

As described in the PHP documentation, the following errors cannot be handled by user-defined functions.
E_ERROR
E_PARSE
E_CORE_ERROR
E_CORE_WARNING
E_COMPILE_ERROR
E_COMPILE_WARNING
E_STRICT
But by using register_shutdown_function() and error_get_last() together to catch a fatal E_ERROR error and direct it to a custom error handler. The code below shows this technique.
set_error_handler('exception_handler');

register_shutdown_function('shutdown_handler');

function exception_handler($err_no, $err_str, $err_file, $err_line)
{
    error_reporting(0);

    // save error log
    // ...

    error_reporting(E_ALL);
}

function shutdown_handler()
{
    $error = error_get_last();
    if (empty($error)) {
        return;
    }
    error_reporting(0);

    // save error log
    // ...

    error_reporting(E_ALL);
}

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