   #PHP Manual Character type functions ctype_cntrl ctype_graph

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                                  ctype_digit

   (PHP 4 >= 4.0.4)
   ctype_digit -- Check for numeric character(s)

Description

   bool ctype_digit ( string text)

   Returns TRUE if every character in text is a decimal digit, FALSE
   otherwise.

   See also ctype_alnum() and ctype_xdigit().
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