(PHP 7, PHP 8)
IntlChar::totitle — Make Unicode character titlecase
$codepoint): int|string|nullThe given character is mapped to its titlecase equivalent. If the character has no titlecase equivalent, the original 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_Titlecase_Mapping of the code point, if any;
otherwise the code point itself. Returns null on failure.
返回类型是 int，如果代码点作为 UTF-8 string 传递，则会返回 string 。失败时返回 null。
示例 #1 Testing different code points
<?php
var_dump(IntlChar::totitle("A"));
var_dump(IntlChar::totitle("a"));
var_dump(IntlChar::totitle("Φ"));
var_dump(IntlChar::totitle("φ"));
var_dump(IntlChar::totitle("1"));
var_dump(IntlChar::totitle(ord("A")));
var_dump(IntlChar::totitle(ord("a")));
?>以上示例会输出：
string(1) "A" string(1) "A" string(2) "Φ" string(2) "Φ" string(1) "1" int(65) int(65)