(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
Locale::canonicalize -- locale_canonicalize — Canonicalize the locale string
public static Locale::canonicalize ( string $locale ) : string
This function is currently not documented; only its argument list is available.
locale
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https://www.php.net/manual/en/locale.canonicalize.php