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IntlChar::isxdigit

PHP function Edit on GitHub ✎

(PHP 7, PHP 8)

Check if code point is a hexadecimal digit

Description

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

Determines whether the specified code point is a hexadecimal digit.

true for characters with general category "Nd" (decimal digit numbers) as well as Latin letters a-f and A-F in both ASCII and Fullwidth ASCII. (That is, for letters with code points 0041..0046, 0061..0066, FF21..FF26, FF41..FF46.)

This is equivalent to IntlChar::digit($codepoint, 16) >= 0.

Parameters

codepoint: Parameter

Return Values

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

Examples

Example

php

<?php
var_dump(IntlChar::isxdigit("A"));
var_dump(IntlChar::isxdigit("1"));
var_dump(IntlChar::isxdigit("\u{2603}"));
?>

The above example will output:

output

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

Notes

Note

In order to narrow the definition of hexadecimal digits to only ASCII characters use:

php

<?php
$isASCIIHexadecimal = IntlChar::ord($codepoint) <= 0x7F && IntlChar::isxdigit($codepoint);
?>