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run code in 150+ php & hhvm versions
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<?php $array1 = array('test1' => 1, 'test2' => 2,'test3' => 3,'test4' => 4,'test5' => 5,'test6' => 6,'test7' => 7,'test8' => 8); $originalArray = $array1; $array2 = array('a','b','c','d','e','f','g'); /* $n = count($array1); for($x = 0; $x < $n; $x++) { array_splice($array1, 1, -$x); print_r ($array1); $array1 = $originalArray; } */ $result = array_splice($array1, -3, 2, $array2); print_r ($array1); print_r($result);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [test1] => 1 [test2] => 2 [test3] => 3 [test4] => 4 [test5] => 5 [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f [6] => g [test8] => 8 ) Array ( [test6] => 6 [test7] => 7 )
Output for hhvm-3.10.0

Process exited with code 153.