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(PHP 7)
IntlChar::getBlockCode — Get the Unicode allocation block containing a code point
$codepoint 
   )Returns the Unicode allocation block that contains the character.
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 the block value for codepoint.
   See the IntlChar::BLOCK_CODE_* constants for possible return values.
  
Example #1 Testing different code points
  <?php
var_dump ( IntlChar :: getBlockCode ( "A" ) ===  IntlChar :: BLOCK_CODE_BASIC_LATIN );
 var_dump ( IntlChar :: getBlockCode ( "Φ" ) ===  IntlChar :: BLOCK_CODE_GREEK );
 var_dump ( IntlChar :: getBlockCode ( "\u{2603}" ) ===  IntlChar :: BLOCK_CODE_MISCELLANEOUS_SYMBOLS );
 ?>   以上例程会输出:
bool(true) bool(true) bool(true)