©
This document uses PHP Chinese website manual Release
(PHP 7)
IntlChar::isxdigit — Check if code point is a hexadecimal digit
$codepoint
)Determines whether the specified code point is a hexadecimal digit.
TRUE
for characters with general category "Nd" (decimal digit numbers) as
well as Latin letters a-f and A-F in both ASCII and Fullwidth ASCII.
(That is, for letters with code points 0041..0046, 0061..0066, FF21..FF26, FF41..FF46.)
This is equivalent to IntlChar::digit($codepoint, 16) >= 0.
codepoint
The integer codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
Returns TRUE
if
codepoint
is a hexadecimal character, FALSE
if not.
Note:
In order to narrow the definition of hexadecimal digits to only ASCII characters use:
<?php
$isASCIIHexadecimal = IntlChar :: ord ( $codepoint ) <= 0x7F && IntlChar :: isxdigit ( $codepoint );
?>
Example #1 Testing different code points
<?php
var_dump ( IntlChar :: isxdigit ( "A" ));
var_dump ( IntlChar :: isxdigit ( "1" ));
var_dump ( IntlChar :: isxdigit ( "\u{2603}" ));
?>
以上例程会输出:
bool(true) bool(true) bool(false)