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<?php $a = []; print_r($a+=['a'=>'1','b'=>'2']); print_r($a+=[]); print_r($a+=['a'=>'3']); print_r($a=array_merge($a,['a'=>'3']));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => 1 [b] => 2 ) Array ( [a] => 1 [b] => 2 ) Array ( [a] => 1 [b] => 2 ) Array ( [a] => 3 [b] => 2 )

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