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<?php $a = array(1,2,3); $a{'simple'} = 'test'; $a{'simeon'} = 'test2'; var_dump($a);
based on OeM38
Output for 4.3.0 - 7.1.7
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) ["simple"]=> string(4) "test" ["simeon"]=> string(5) "test2" }