translate non alphanumeric characters from file name into underscores

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Translate non alphanumeric characters into an underscore. Doesn't create double underscores if there's two spaces in a row. Also turns name to lowercase. Use with trim to avoid spaces at front or end.

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  1. $filename=trim($_FILES['pdf']['name']);
  2. $name = preg_replace('/[^a-z0-9.]+/', '_', strtolower($filename));


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