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IntlChar::isalnum	IntlChar::isbase

IntlChar	Last updated: Mon, 26 Oct 2026

IntlChar::isalpha

(PHP 7, PHP 8)

IntlChar::isalpha — Check if code point is a letter character

Description

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

Determines whether the specified code point is a letter character. true for general categories "L" (letters).

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 a letter character, false if not. Returns null on failure.

Examples

Example #1 Testing different code points

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

The above example will output:

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

See Also

IntlChar::isalnum() - Check if code point is an alphanumeric character
IntlChar::isdigit() - Check if code point is a digit character
ctype_alpha() - Check for alphabetic character(s)

IntlChar::isalnum	IntlChar::isbase

IntlChar	Last updated: Mon, 26 Oct 2026