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<?php $t = []; (true) ? $t['test'] = 1 : null; (false) ?: $t['aaaa'] = 1; var_dump($t);
Output for 7.0.0 - 7.0.20, 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(2) { ["test"]=> int(1) ["aaaa"]=> int(1) }

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167.05 ms | 403 KiB | 199 Q