(PHP 7)
IntlChar::isdigit — Check if code point is a digit character
Determines 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.
Returns TRUE if
codepoint is a digit character, FALSE if not.
Example #1 Testing different code points
<?php
var_dump(IntlChar::isdigit("A"));
var_dump(IntlChar::isdigit("1"));
var_dump(IntlChar::isdigit("\t"));
?>
以上例程会输出：
bool(false) bool(true) bool(false)