Pass php error to default php error handler in my custom error handler

Question

I can't manage the following: I have an error handler which catches all E_WARNINGS but I only want to handle some of the warnings all the other I want to ignore and pass them to the default PHP error handler (which also takes all the other error types except the E_WARNINGS).

Is this even possible? Look at my simple error handler:

set_error_handler(function($errno, $errstr, $errfile, $errline, $errcontext) {
    if($errfile != 'somefile_for_example.php') {
        // I don't care about this error throw it somewhere else!
    }

    echo 'error in this file handles my custom error handler';
    return true;
}, E_WARNING);

Answer 1

PHP documentation says at: http://php.net/manual/en/function.set-error-handler.php

It is important to remember that the standard PHP error handler is completely bypassed for the error types specified by error_types unless the callback function returns FALSE.

Maybe then this should work:

$old_error_handler = set_error_handler(
    function($errno, $errstr, $errfile, $errline, $errcontext) {

        if($errfile != 'somefile_for_example.php') {
            return false;
        }

        echo 'error in this file handles my custom error handler';
        return true;
    }, E_WARNING);

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[Edit] Another user (Philipp) commented that set_error_handler returns old handler, but only for another custom one, not for the default handler.

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In any case, when programming error handlers, one must always be extra careful with programming errors, as they cannot be handled (maybe test the functions by themselves first).