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IntlChar::isdefined

(PHP 7, PHP 8)

IntlChar::isdefinedCheck whether the code point is defined

说明

public static IntlChar::isdefined(mixed $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. 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 defined character, false if not.

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

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