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This question is about code optimalization: What is better for performance and why (the first example is cleaner for human being->programmer->me)?
$value = $anothervalue = getValue();
or
$anothervalue = $getValue;
$value = $anothervalue;
This has nothing to do with real performance issues.
Performance improvement is when you replaced 100 sql queries with 1 and reduced page generation time from 1 second to 0.0001s
As long as you cannot (can you?) measure the difference between 2 cases – use the one that is more readable and easy to maintain