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(PHP 7)
IntlChar::isUAlphabetic — Check if code point has the Alphabetic Unicode property
$codepoint 
   )Check if a code point has the Alphabetic Unicode property.
This is the same as IntlChar::hasBinaryProperty($codepoint, IntlChar::PROPERTY_ALPHABETIC)
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 has the Alphabetic Unicode property,  FALSE  if not.
  
Example #1 Testing different code points
  <?php
var_dump ( IntlChar :: isUAlphabetic ( "A" ));
 var_dump ( IntlChar :: isUAlphabetic ( "1" ));
 var_dump ( IntlChar :: isUAlphabetic ( "\u{2603}" ));
 ?>   以上例程会输出:
bool(true) bool(false) bool(false)
IntlChar::PROPERTY_ALPHABETIC