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(PHP 7)
IntlChar::charType — Get the general category value for a code point
$codepoint 
   )Returns the general category value for the code point.
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 general category type, which may be one of the following constants:
IntlChar::CHAR_CATEGORY_UNASSIGNED  IntlChar::CHAR_CATEGORY_GENERAL_OTHER_TYPES  IntlChar::CHAR_CATEGORY_UPPERCASE_LETTER  IntlChar::CHAR_CATEGORY_LOWERCASE_LETTER  IntlChar::CHAR_CATEGORY_TITLECASE_LETTER  IntlChar::CHAR_CATEGORY_MODIFIER_LETTER  IntlChar::CHAR_CATEGORY_OTHER_LETTER  IntlChar::CHAR_CATEGORY_NON_SPACING_MARK  IntlChar::CHAR_CATEGORY_ENCLOSING_MARK  IntlChar::CHAR_CATEGORY_COMBINING_SPACING_MARK  IntlChar::CHAR_CATEGORY_DECIMAL_DIGIT_NUMBER  IntlChar::CHAR_CATEGORY_LETTER_NUMBER  IntlChar::CHAR_CATEGORY_OTHER_NUMBER  IntlChar::CHAR_CATEGORY_SPACE_SEPARATOR  IntlChar::CHAR_CATEGORY_LINE_SEPARATOR  IntlChar::CHAR_CATEGORY_PARAGRAPH_SEPARATOR  IntlChar::CHAR_CATEGORY_CONTROL_CHAR  IntlChar::CHAR_CATEGORY_FORMAT_CHAR  IntlChar::CHAR_CATEGORY_PRIVATE_USE_CHAR  IntlChar::CHAR_CATEGORY_SURROGATE  IntlChar::CHAR_CATEGORY_DASH_PUNCTUATION  IntlChar::CHAR_CATEGORY_START_PUNCTUATION  IntlChar::CHAR_CATEGORY_END_PUNCTUATION  IntlChar::CHAR_CATEGORY_CONNECTOR_PUNCTUATION  IntlChar::CHAR_CATEGORY_OTHER_PUNCTUATION  IntlChar::CHAR_CATEGORY_MATH_SYMBOL  IntlChar::CHAR_CATEGORY_CURRENCY_SYMBOL  IntlChar::CHAR_CATEGORY_MODIFIER_SYMBOL  IntlChar::CHAR_CATEGORY_OTHER_SYMBOL  IntlChar::CHAR_CATEGORY_INITIAL_PUNCTUATION  IntlChar::CHAR_CATEGORY_FINAL_PUNCTUATION  IntlChar::CHAR_CATEGORY_CHAR_CATEGORY_COUNT  Example #1 Testing different code points
  <?php
var_dump ( IntlChar :: charType ( "A" ) ===  IntlChar :: CHAR_CATEGORY_UPPERCASE_LETTER );
 var_dump ( IntlChar :: charType ( "." ) ===  IntlChar :: CHAR_CATEGORY_OTHER_PUNCTUATION );
 var_dump ( IntlChar :: charType ( "\t" ) ===  IntlChar :: CHAR_CATEGORY_CONTROL_CHAR );
 var_dump ( IntlChar :: charType ( "\u{2603}" ) ===  IntlChar :: CHAR_CATEGORY_OTHER_SYMBOL );
 ?>   以上例程会输出:
bool(true) bool(true) bool(true) bool(true)