Detect and convert utf-8 on string

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I can't say I can rely on mb_detect_encoding(). Had some freaky false positives a while back. The following code will detect when you need to enconde or decode it.

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  1. if (preg_match('!!u', $string))
  2. {
  3. // this is utf-8
  4. }
  5. else
  6. {
  7. // definitely not utf-8
  8. }

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