IntlChar::isxdigit

(PHP 7, PHP 8)

IntlChar::isxdigit — Check if code point is a hexadecimal digit

Descrizione

public static IntlChar::isxdigit(int|string $codepoint): ?bool

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.

Elenco dei parametri

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}")

Valori restituiti

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

Esempi

Example #1 Testing different code points

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

Il precedente esempio visualizzerà:

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

Note

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

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

Vedere anche:

IntlChar::isdigit() - Check if code point is a digit character
ctype_xdigit() - Controlla i caratteri che rappresentano una cifra esadecimale

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