(PHP 4, PHP 5, PHP 7)
textdomain — Sets the default domain
textdomain ( string|null $domain ) : string
This function sets the domain to search within when calls are made to gettext(), usually the named after an application.
domain
The new message domain, or null to get the current setting without changing it
If successful, this function returns the current message domain, after possibly changing it.
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https://www.php.net/manual/en/function.textdomain.php