??= will also assign the value on first call, besides checking if it's set, meaning that the second time it gets reached it will have a value assigned and PropertyAccess::createPropertyAccessor() will no longer get called.
?? is just a classic isset check meaning the call to createProperyAccesor() is made every time it gets reached.
They're quite different although they look similar.
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??= will also assign the value on first call, besides checking if it's set, meaning that the second time it gets reached it will have a value assigned and
PropertyAccess::createPropertyAccessor()will no longer get called.?? is just a classic isset check meaning the call to
createProperyAccesor()is made every time it gets reached.They're quite different although they look similar.