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function array_mergev($arrayv)
libphutil Technical Documentation (Core Utilities)

Merge a vector of arrays performantly. This has the same semantics as array_merge(), so these calls are equivalent:

array_merge($a, $b, $c);
array_mergev(array($a, $b, $c));

However, when you have a vector of arrays, it is vastly more performant to merge them with this function than by calling array_merge() in a loop, because using a loop generates an intermediary array on each iteration.

Parameters
list$arrayvVector of arrays to merge.
Return
listArrays, merged with array_merge() semantics.