repetition of tedious references

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consider the following statement:

$language =
isset($_SERVER["HTTP_ACCEPT_LANGUAGE"]) &&
$_SERVER["HTTP_ACCEPT_LANGUAGE"] != "" ?
$_SERVER["HTTP_ACCEPT_LANGUAGE"] : "*";

when using strings in arrays that may be non-existing or empty, you
have to repeat the reference  *three* times, which gets excessive and
unreadable.

is there any way to only have to write
$_SERVER["HTTP_ACCEPT_LANGUAGE"] only once?

i know it's possible to supress "is not set" with @, but that just
seems wrong in case there really is an error in the statement.

i love php, but this is one of my pet peeves.

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