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run code in 150+ php & hhvm versions
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<?php $a = array('youpi' => 'trololo', 42, 616 => 'real number of the Beast'); var_export(array_merge(array(), $a));
Output for 4.3.0 - 7.1.0
array ( 'youpi' => 'trololo', 0 => 42, 1 => 'real number of the Beast', )