IntlChar::isxdigit
(PHP 7, PHP 8)
IntlChar::isxdigit — Check if code point is a hexadecimal digit
Description
$codepoint): ?boolDetermines whether the specified code point is a hexadecimal digit.
true for characters with general category "Nd" (decimal digit numbers) as
well as Latin letters a-f and A-F in both ASCII and Fullwidth ASCII.
(That is, for letters with code points 0041..0046, 0061..0066, FF21..FF26, FF41..FF46.)
This is equivalent to IntlChar::digit($codepoint, 16) >= 0.
Parameters
-
codepoint -
The int codepoint value (e.g.
0x2603for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g."\u")
Return Values
Returns true if
codepoint is a hexadecimal character, false if not. Returns null on failure.
Examples
Example #1 Testing different code points
<?php
var_dump(IntlChar::isxdigit("A"));
var_dump(IntlChar::isxdigit("1"));
var_dump(IntlChar::isxdigit("\u"));
?>
The above example will output:
bool(true) bool(true) bool(false)
Notes
Note:
In order to narrow the definition of hexadecimal digits to only ASCII characters use:
<?php
$isASCIIHexadecimal = IntlChar::ord($codepoint) <= 0x7F && IntlChar::isxdigit($codepoint);
?>
