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(PHP 7)
IntlChar::ispunct — Check if code point is punctuation character
$codepoint 
   )Determines whether the specified code point is a punctuation character.
  TRUE  for characters with general categories "P" (punctuation).
  
codepoint The integer codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
   Returns  TRUE  if
   codepoint is a punctuation character,  FALSE  if not.
  
Example #1 Testing different code points
  <?php
var_dump ( IntlChar :: ispunct ( "." ));
 var_dump ( IntlChar :: ispunct ( "," ));
 var_dump ( IntlChar :: ispunct ( "\n" ));
 var_dump ( IntlChar :: ispunct ( "$" ));   以上例程会输出:
bool(true) bool(true) bool(false) bool(false)