This page is a quick reference for people already familiar with the class. If this is new to you, we strongly recommend reading the introductory guides first: Vector is a stack-like collection. HHVM provides a native implementation for this class. The PHP class definition below is not actually used at run time, it is simply provided for the typechecker and for developer reference. Like all objects in PHP, Vectors have reference-like semantics. When a caller passes a Vector to a callee, the callee can modify the Vector and the caller will see the changes. Vectors do not have 'copy-on-write' semantics. Vectors support $m[$k] style syntax for getting and setting values by key. Vectors also support isset($m[$k]) and empty($m[$k]) syntax, and they provide similar semantics as arrays. Elements can be added to a Vector using $m[] = .. syntax. Vectors do not support iterating while new elements are being added or elements are being removed. When a new element is added or removed, all iterators that point to the Vector shall be considered invalid. Vectors do not support taking elements by reference. If binding assignment (=&) is used with an element of a Vector, or if an element of a Vector is passed by reference, of if a Vector is used with foreach by reference, an exception will be thrown. Source.

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