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set_error_handler(): duplicate error

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  set_error_handler(): duplicate error alex <1j9448a02@lnx159sneakemail.com.invalid> - 2021-06-10 11:03 +0200
    Re: set_error_handler(): duplicate error Härra Ramob <ya12983@mail.com> - 2022-01-05 00:32 -0800

#13065 — set_error_handler(): duplicate error

<?php
//error_reporting(0);
set_error_handler(
     static function (int $severity, string $message, string $file, int 
$line): void {
         throw new InternalErrorException($message, 0, $severity, $file, 
$line);
     }
);

xxx();

Output:

Fatal error: Uncaught Error: Call to undefined function xxx() in 
/tmp/tmp.Ie1UVhkWcT/test.php on line 9

Error: Call to undefined function xxx() in /tmp/tmp.Ie1UVhkWcT/test.php 
on line 9

Call Stack:
     0.0001     392928   1. {main}() /tmp/tmp.Ie1UVhkWcT/test.php:0

Why error message showing is duplicate?
Furthermore, if uncommenting the error_reporting(0) instruction does not 
show any errors.
is there a good compromise?

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