"php object assignment vs cloning" Code Answer
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Objects are abstract data in memory. A variable always holds a reference to this data in memory. Imagine that
$foo = new Bar
creates an object instance ofBar
somewhere in memory, assigns it some id#42
, and$foo
now holds this#42
as reference to this object. Assigning this reference to other variables by reference or normally works the same as with any other values. Many variables can hold a copy of this reference, but all point to the same object.clone
explicitly creates a copy of the object itself, not just of the reference that points to the object.Just don't confuse "reference" as in
=&
with "reference" as in object identifier.