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run code in 200+ php & hhvm versions
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<?php $array = array( 'a' => 1, 'b' => 1 ); arsort( $array ); var_dump( $array );
Output for hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.15.4, 7.0.0 - 7.1.7
array(2) { ["a"]=> int(1) ["b"]=> int(1) }
Output for hhvm-3.12.14, hhvm-3.17.3

Process exited with code 137.
Output for 4.3.0 - 5.6.30
array(2) { ["b"]=> int(1) ["a"]=> int(1) }