(PHP 7, PHP 8)
IntlChar::isalpha — Check if code point is a letter character
$codepoint): ?bool
Determines whether the specified code point is a letter character. true for general categories "L" (letters).
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 letter character, false if not. Returns null on failure.
示例 #1 Testing different code points
<?php
var_dump(IntlChar::isalpha("A"));
var_dump(IntlChar::isalpha("1"));
var_dump(IntlChar::isalpha("\u{2603}"));
?>以上示例会输出：
bool(true) bool(false) bool(false)