   #PHP Manual Character type functions ctype_alpha ctype_digit

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                                  ctype_cntrl

   (PHP 4 >= 4.0.4)
   ctype_cntrl -- Check for control character(s)

Description

   bool ctype_cntrl ( string text)

   Returns TRUE if every character in text has a special control
   function, FALSE otherwise. Control characters are e.g. line feed, tab,
   esc.
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