IntlChar::isalnum

(PHP 7, PHP 8)

IntlChar::isalnum — Check if code point is an alphanumeric character

说明

public static IntlChar::isalnum(int|string $codepoint): ?bool

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).

参数

codepoint: The int 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 an alphanumeric character, false if not. Returns null on failure.

示例

示例 #1 Testing different code points

<?php
var_dump(IntlChar::isalnum("A"));
var_dump(IntlChar::isalnum("1"));
var_dump(IntlChar::isalnum("\u{2603}"));
?>

以上示例会输出：

bool(true)
bool(true)
bool(false)

参见

IntlChar::isalpha() - Check if code point is a letter character
IntlChar::isdigit() - Check if code point is a digit character
ctype_alnum() - 检测字母数字式字符

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