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<?php ini_set('display_errors', '1'); error_reporting(E_ALL); $x = preg_grep('#\d#u', ['a', "1\xFF", 'c'], 0); var_dump($x);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(0) { }

preferences:
149.92 ms | 403 KiB | 168 Q