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run code in 150+ php & hhvm versions
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<?php $array1 = array("a" => array(1)); $array2 = array("demo", "b" => array("1")); $result = array_intersect($array1, $array2); print_r($result);
based on TJ0NM
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Array to string conversion in /in/GG8sd on line 4 Notice: Array to string conversion in /in/GG8sd on line 4 Notice: Array to string conversion in /in/GG8sd on line 4 Array ( [a] => Array ( [0] => 1 ) )
Output for hhvm-3.12.0
Notice: Array to string conversion in /in/GG8sd on line 4 Notice: Array to string conversion in /in/GG8sd on line 4 Array ( [a] => Array ( [0] => 1 ) )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.3.29
Array ( [a] => Array ( [0] => 1 ) )