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<?php $a[] = [1,2]; echo"<pre>"; print_r($a);
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<pre>Array ( [0] => Array ( [0] => 1 [1] => 2 ) )

preferences:
186.5 ms | 403 KiB | 180 Q