Online PHP editor | refs for RtkBu

<?php set_error_handler(function ($_, $errstr) { restore_error_handler(); echo 'handler:' . var_export($errstr, true) . \PHP_EOL; }); echo 'execution:' . \var_export(\preg_match('//u', "\xc3\x28"), true) . \PHP_EOL; echo 'error:' . var_export(\preg_last_error(), true) . \PHP_EOL; echo 'compilation:' . \var_export(\preg_match('/(/', 'a'), true) . \PHP_EOL; echo 'error:' . var_export(\preg_last_error(), true) . \PHP_EOL; \restore_error_handler(); echo 'ok:' . var_export(\preg_match('/./', 'a'), true) . \PHP_EOL; echo 'error:' . var_export(\preg_last_error(), true) . \PHP_EOL;