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IntlChar::isdefined

PHP function Edit on GitHub ✎

(PHP 7, PHP 8)

Check whether the code point is defined

Description

IntlChar::isdefined(int|string $codepoint): bool|null

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).

Note

Note that non-character code points (e.g., U+FDD0) are not "defined" (they are Cn), but surrogate code points are "defined" (Cs).

Returns true if codepoint is a defined character, false if not. Returns null on failure.

Example

php

<?php
var_dump(IntlChar::isdefined("A"));
var_dump(IntlChar::isdefined(" "));
var_dump(IntlChar::isdefined("\u{FDD0}"));
?>

The above example will output:

output

bool(true)
bool(true)
bool(false)