- PHP 手册
- 函数参考
- 国际化与字符编码支持
- intl
- IntlChar
IntlChar::isdefined
(PHP 7, PHP 8)
IntlChar::isdefined — Check whether the code point is defined
说明
public static IntlChar::isdefined(int|string$codepoint): ?bool
Determines whether the specified code point is "defined", which usually means that it is assigned a character.
true for general categories other than "Cn" (other, not assigned).
注意:
Note that non-character code points (e.g., U+FDD0) are not "defined" (they are Cn), but surrogate code points are "defined" (Cs).
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 defined character, false if not. Returns null on failure.
范例
示例 #1 Testing different code points
<?php
var_dump(IntlChar::isdefined("A"));
var_dump(IntlChar::isdefined(" "));
var_dump(IntlChar::isdefined("\u{FDD0}"));
?>
以上例程会输出：
bool(true) bool(true) bool(false)
参见
- IntlChar::isdigit() - Check if code point is a digit character
- IntlChar::isalpha() - Check if code point is a letter character
- IntlChar::isalnum() - Check if code point is an alphanumeric character
- IntlChar::isupper() - Check if code point has the general category "Lu" (uppercase letter)
- IntlChar::islower() - Check if code point is a lowercase letter
- IntlChar::istitle() - Check if code point is a titlecase letter
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/intlchar.isdefined.php