IntlChar::isxdigit

(PHP 7)

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

说明

public static bool IntlChar::isxdigit ( mixed $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.

参数

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}")

返回值

Returns TRUE if codepoint is a hexadecimal character, FALSE if not.

注释

Note:

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

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

范例

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)

参见

IntlChar::isdigit() - Check if code point is a digit character