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run code in 200+ php & hhvm versions
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<?php $test = [['foo' => 'bar'],['foo' => 'bar']]; var_export(array_unique($test, SORT_REGULAR));
based on 4WLAg
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array ( 0 => array ( 'foo' => 'bar', ), )