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<?php $xyz[][][]=0; $abc = [ "MA" => [ "Zia Rehman" => [] ] ]; if(array_key_exists("Zia Rehman", $xyz)) { echo "hi"; $xyz['MA']['Zia Rehman'] = []; } var_dump($xyz);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [0]=> array(1) { [0]=> array(1) { [0]=> int(0) } } }

preferences:
219.96 ms | 403 KiB | 287 Q