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run code in 150+ php & hhvm versions
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<?php $a = array( 2,55,6); $a = array_flip($a); unset( $a[55] ); var_dump(array_flip($a) );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> int(2) [2]=> int(6) }
Output for hhvm-3.10.0

Process exited with code 153.