Check if code point is permissible as the first character in a Java identifier
  • « IntlChar::isJavaIDPart
    		•   
  • IntlChar::isJavaSpaceChar »
    		•
    • PHP Manual
    • IntlChar
    • Check if code point is permissible as the first character in a Java identifier

    IntlChar::isJavaIDStart

    (PHP 7, PHP 8)

    IntlChar::isJavaIDStart — Check if code point is permissible as the first character in a Java identifier

    Description

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

    Determines if the specified character is permissible as the start of a Java identifier.

    In addition to IntlChar::isIDStart(), true for characters with general categories "Sc" (currency symbols) and "Pc" (connecting punctuation).

    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 start a Java identifier, false if not. Returns null on failure.

    Examples

    Example #1 Testing different code points

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

    The above example will output:

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

    See Also