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<?php $var1 = array( "test1" => 1, "test2" => 2, ); $var2 = array( "test1" => 1, ); $var3 = $var1 + $var2; print_r($var3); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [test1] => 1 [test2] => 2 )