WP_Filesystem_Direct::owner( string $file ): string|false

Source

public function owner( $file ) {
	$owneruid = @fileowner( $file );

	if ( ! $owneruid ) {
		return false;
	}

	if ( ! function_exists( 'posix_getpwuid' ) ) {
		return $owneruid;
	}

	$ownerarray = posix_getpwuid( $owneruid );

	if ( ! $ownerarray ) {
		return false;
	}

	return $ownerarray['name'];
}

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