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Scala list concatenation, ::: vs ++
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Frequency table for a single variable
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Are parallel calls to send/recv on the same socket valid?
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Two single-column indexes vs one two-column index in MySQL?
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ASP.NET: This method cannot be called during the application's pre-start initialization stage
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Scala: What is the difference between Traversable and Iterable traits in Scala collections?
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Why does this assert throw a format exception when comparing structures?
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What does it mean to hydrate an object?
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Difference between `const shared_ptr` and `shared_ptr`?
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PHP function to get the subdomain of a URL
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Here's a one line solution:
array_shift((explode('.', $_SERVER['HTTP_HOST'])));
Or using your example:
array_shift((explode('.', 'en.example.com')));
EDIT: Fixed "only variables should be passed by reference" by adding double parenthesis.
EDIT 2: Starting from PHP 5.4 you can simpl...