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<?php $basename = "a\xFFnything"; print("Before: ".$basename.PHP_EOL); $basename = preg_replace('/[\x00-\x1F]/u', '_', $basename); print("After: ".array_flip(get_defined_constants(true)['pcre'])[preg_last_error()]);

This is an error 500

Value for `_results` contains invalid data `array`


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