How to check is timezone identifier valid from code?

Question

I\'ll try to explain what\'s the problem here.

According to list of supported timezones from PHP manual, I can see all valid TZ identifiers in PHP.

My first

Answer 1

I would research what changes the perfect array and use a basic caching mechanism (like store the array in a file, that you include and update when needed). You're currently optimizing building an array that is static for 99.9999% of all the requests.

Edit: Ok, static/dynamic.

if( !function_exists(timezone_version_get) )
{
    function timezone_version_get() { return '2009.6'; }
}
include 'tz_list_' . PHP_VERSION . '_' . timezone_version_get() . '.php';

Now each time the php version is updated, the file should be regenerated automatically by your code.