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<?php $a = array(1=>"2",2=>"3",3=>"4"); $b = array(1=>"5"); var_dump($a+$b);
Output for 4.3.0 - 7.1.0
array(3) { [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" }