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<?php $d = array( 'a', 'b'=> 'c' ); var_dump( $d );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(1) "a" ["b"]=> string(1) "c" }