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run code in 200+ php & hhvm versions
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<?php print_r((array)1); print_r((array)array()); print_r((array)'aaa');
Output for 5.4.45 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Array ( [0] => 1 ) Array ( ) Array ( [0] => aaa )