(PHP 7, PHP 8)
IntlChar::toupper — Make Unicode character uppercase
The given character is mapped to its uppercase equivalent. If the character has no uppercase equivalent, the character itself is returned.
codepointThe int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
Returns the Simple_Uppercase_Mapping of the code point, if any; otherwise the code point itself.
The return type will be int unless the code point was passed as a UTF-8 string, in which case a string will be returned.
Example #1 Testing different code points
<?php
var_dump(IntlChar::toupper("A"));
var_dump(IntlChar::toupper("a"));
var_dump(IntlChar::toupper("Φ"));
var_dump(IntlChar::toupper("φ"));
var_dump(IntlChar::toupper("1"));
var_dump(IntlChar::toupper(ord("A")));
var_dump(IntlChar::toupper(ord("a")));
?>
以上例程会输出：
string(1) "A" string(1) "A" string(2) "Φ" string(2) "Φ" string(1) "1" int(65) int(65)