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<?php $a = ['teste' => 'teste']; $key = null; var_dump($this->paymentMetadata[$key] ?? $key === nulll ? $this->paymentMetadata : null);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 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
Fatal error: Uncaught Error: Using $this when not in object context in /in/DraZT:5 Stack trace: #0 {main} thrown in /in/DraZT on line 5
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/DraZT on line 5
Process exited with code 255.

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