IntlChar::istitle
(PHP 7, PHP 8)
IntlChar::istitle — Check if code point is a titlecase letter
说明
public static IntlChar::istitle(int|string
$codepoint): ?boolDetermines whether the specified code point is a titlecase letter.
true for general category "Lt" (titlecase letter).
参数
-
codepoint -
The int codepoint value (e.g.
0x2603for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g."\u{2603}")
返回值
Returns true if
codepoint is a titlecase letter, false if not. Returns null on failure.
范例
示例 #1 Testing different code points
<?php
var_dump(IntlChar::istitle("A"));
var_dump(IntlChar::istitle("a"));
var_dump(IntlChar::istitle("Φ"));
var_dump(IntlChar::istitle("φ"));
var_dump(IntlChar::istitle("1"));
?>
以上例程会输出：
bool(false) bool(true) bool(false) bool(true) bool(false)
参见
- IntlChar::isupper() - Check if code point has the general category "Lu" (uppercase letter)
- IntlChar::islower() - Check if code point is a lowercase letter
- IntlChar::totitle() - Make Unicode character titlecase
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