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

    (PHP 7, PHP 8)

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

    Description

    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).

    Parameters

    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}")

    Return Values

    Returns true if codepoint is an alphanumeric character, false if not. Returns null on failure.

    Examples

    Example #1 Testing different code points

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

    The above example will output:

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

    See Also