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<?php $array = ['key1' => 65456]; //$array .= ['key2' => 'udfghf']; var_dump($array);
based on t39vg
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(1) { ["key1"]=> int(65456) }