(PHP 7)
IntlChar::isalnum — Check if code point is an alphanumeric character
Determines whether the specified code point is an alphanumeric character (letter or digit). TRUE for characters with general categories "L" (letters) and "Nd" (decimal digit numbers).
Returns TRUE if
codepoint is an alphanumeric character, FALSE if not.
Example #1 Testing different code points
<?php
var_dump(IntlChar::isalnum("A"));
var_dump(IntlChar::isalnum("1"));
var_dump(IntlChar::isalnum("\u{2603}"));
?>
以上例程会输出：
bool(true) bool(true) bool(false)