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IntlChar::isISOControl	IntlChar::isJavaIDStart

IntlChar	Last updated: Mon, 26 Oct 2026

IntlChar::isJavaIDPart

(PHP 7, PHP 8)

IntlChar::isJavaIDPart — Check if code point is permissible in a Java identifier

Description

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

Determines if the specified character is permissible in a Java identifier.

In addition to IntlChar::isIDPart(), true for characters with general category "Sc" (currency symbols).

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 may occur in a Java identifier, false if not. Returns null on failure.

Examples

Example #1 Testing different code points

<?php
var_dump(IntlChar::isJavaIDPart("A"));
var_dump(IntlChar::isJavaIDPart("$"));
var_dump(IntlChar::isJavaIDPart("\n"));
var_dump(IntlChar::isJavaIDPart("\u{2603}"));
?>

The above example will output:

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

See Also

IntlChar::isIDIgnorable() - Check if code point is an ignorable character
IntlChar::isIDPart() - Check if code point is permissible in an identifier
IntlChar::isJavaIDStart() - Check if code point is permissible as the first character in a Java identifier
IntlChar::isalpha() - Check if code point is a letter character
IntlChar::isdigit() - Check if code point is a digit character

IntlChar::isISOControl	IntlChar::isJavaIDStart

IntlChar	Last updated: Mon, 26 Oct 2026