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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()]);
Output for git.master, git.master_jit, rfc.property-hooks
Before: a�nything Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/EfiFs on line 5 After: PREG_BAD_UTF8_ERROR

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