Problem run via the command-line [SOLVED]

Please show what code is in line 49

PHP Code:

if (! function_exists('app_timezone'))
{
 /**
 * Returns the timezone the application has been set to display
 * dates in. This might be different than the timezone set
 * at the server level, as you often want to stores dates in UTC
 * and convert them on the fly for the user.
 *
 * @return string
 */ 
 function app_timezone(): string
 {
 $config = config(App::class);

 return $config->appTimezone;
 }
} 


Line 49 is:  function app_timezone(): string

If I delete this function, the same PHP Parse error appear next function has syntax "function {any_name} : string".

I think Terminal don't accept syntax "function {any_name} : string". But This is Ci4 System file, I don't interfere