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run code in 150+ php & hhvm versions
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<?php $a1=array("a"=>"purple","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("a"=>"purple","b"=>"orange"); array_splice($a1,0,1,$a2); print_r($a1);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => purple [1] => orange [b] => green [c] => blue [d] => yellow )