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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): ?bool

Determines 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. 0x2603 for 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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