(PHP 7, PHP 8)
IntlChar::isdigit — Check if code point is a digit character
$codepoint): ?boolDetermines whether the specified code point is a digit character.
true for characters with general category "Nd" (decimal digit numbers). Beginning with Unicode 4, this is the same as testing for the Numeric_Type of Decimal.
codepointThe int 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 digit character, false if not. Returns null on failure.
示例 #1 Testing different code points
<?php
var_dump(IntlChar::isdigit("A"));
var_dump(IntlChar::isdigit("1"));
var_dump(IntlChar::isdigit("\t"));
?>以上示例会输出：
bool(false) bool(true) bool(false)