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<?php $a = [1=>'a', 3=>'v', 5=>'t'] + ['z', 'b','m']; var_dump($a); echo count($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [1]=> string(1) "a" [3]=> string(1) "v" [5]=> string(1) "t" [0]=> string(1) "z" [2]=> string(1) "m" } 5

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