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run code in 300+ PHP versions simultaneously
<?php $test['t'][0] = 'test'; var_dump(isset($test['t'][1]));
Output for 7.3.24 - 7.3.33, 7.4.12 - 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
bool(false)

preferences:
112.23 ms | 402 KiB | 114 Q