php setlocales第二个参数为字符串

Question

I'm trying to use php setlocale() for dates. Setting it like:

setlocale(LC_TIME, 'pl_utf8','Polish','pl.UTF-8','Polish_Poland.1250','WINDOWS-1250');

works fine, but if I use variable which stores the second parameter like:

setlocale(LC_TIME, $locale);

it does not work.

Now var $locale contains the exact string 'pl_utf8','Polish','pl.UTF-8','Polish_Poland.1250','WINDOWS-1250' which is being pulled from database.

Why isn't working?

Answer 1

$locale = "'foo','bar','baz'";
setlocale(LC_TIME, $locale);

is the same as

setlocale(LC_TIME, "'foo','bar','baz'");

which is not the same as

setlocale(LC_TIME, 'foo', 'bar', 'baz');

The latter passes 4 separate arguments, the former two versions just pass 2 arguments, with the second argument not being in a format that setlocale understands. Alternatively to passing multiple strings, you can also pass an array:

setlocale(LC_TIME, array('foo', 'bar', 'baz'));

But to get the string "'foo','bar','baz'" into the form of the array array('foo', 'bar', 'baz'), you have to do something like this:

$locales = array_map(function ($l) { return trim($l, "'"); }, explode(',', $locale));

Which is needlessly complicated. You need to store your locales differently in the database to simplify that, right now their format simply isn't suited well for this operation.